Type.GetProperty 方法
定義
重要
部分資訊涉及發行前產品,在發行之前可能會有大幅修改。 Microsoft 對此處提供的資訊,不做任何明確或隱含的瑕疵擔保。
取得目前 Type 的特定屬性。
多載
| GetProperty(String, BindingFlags, Binder, Type, Type[], ParameterModifier[]) |
使用指定的繫結條件約束搜尋指定的屬性,而該屬性的參數符合指定的引數類型和修飾詞。 |
| GetProperty(String, Type, Type[], ParameterModifier[]) |
搜尋指定的公用屬性,其參數符合指定的引數類型和修飾詞。 |
| GetProperty(String, Type[]) |
搜尋指定的公用屬性,其參數符合指定的引數類型。 |
| GetProperty(String, Type, Type[]) |
搜尋指定的公用屬性,其參數符合指定的引數類型。 |
| GetProperty(String, BindingFlags) |
使用指定的繫結條件約束搜尋指定的屬性。 |
| GetProperty(String) |
搜尋具有指定名稱的公用屬性。 |
| GetProperty(String, Type) |
搜尋具有指定名稱和傳回類型的公用屬性。 |
GetProperty(String, BindingFlags, Binder, Type, Type[], ParameterModifier[])
- 來源:
- Type.cs
- 來源:
- Type.cs
- 來源:
- Type.cs
使用指定的繫結條件約束搜尋指定的屬性,而該屬性的參數符合指定的引數類型和修飾詞。
public:
virtual System::Reflection::PropertyInfo ^ GetProperty(System::String ^ name, System::Reflection::BindingFlags bindingAttr, System::Reflection::Binder ^ binder, Type ^ returnType, cli::array <Type ^> ^ types, cli::array <System::Reflection::ParameterModifier> ^ modifiers);
public System.Reflection.PropertyInfo? GetProperty (string name, System.Reflection.BindingFlags bindingAttr, System.Reflection.Binder? binder, Type? returnType, Type[] types, System.Reflection.ParameterModifier[]? modifiers);
public System.Reflection.PropertyInfo GetProperty (string name, System.Reflection.BindingFlags bindingAttr, System.Reflection.Binder binder, Type returnType, Type[] types, System.Reflection.ParameterModifier[] modifiers);
abstract member GetProperty : string * System.Reflection.BindingFlags * System.Reflection.Binder * Type * Type[] * System.Reflection.ParameterModifier[] -> System.Reflection.PropertyInfo
override this.GetProperty : string * System.Reflection.BindingFlags * System.Reflection.Binder * Type * Type[] * System.Reflection.ParameterModifier[] -> System.Reflection.PropertyInfo
Public Function GetProperty (name As String, bindingAttr As BindingFlags, binder As Binder, returnType As Type, types As Type(), modifiers As ParameterModifier()) As PropertyInfo
參數
- name
- String
字串,包含要取得的屬性名稱。
- binder
- Binder
定義一組屬性並啟用繫結的物件,可包含多載方法的選擇、引數類型的強制,以及透過反映的成員引動過程。
-或-
Null 參考 (在 Visual Basic 中為Nothing ),可使用 DefaultBinder。
- returnType
- Type
屬性的傳回類型。
- types
- Type[]
Type 物件的陣列,代表所要取得之索引屬性的參數數目、順序和類型。
-或-
用以取得未編製索引的屬性之 Type 類型的空陣列 (也就是,Type[] types = new Type[0])。
- modifiers
- ParameterModifier[]
ParameterModifier 物件的陣列,代表在 types 陣列中與對應項目關聯的屬性。 預設的繫結器不會處理這個參數。
傳回
代表符合指定之需求屬性的物件 (如有找到);否則為 null。
實作
例外狀況
找到一個以上的屬性,其具有指定名稱,且符合指定繫結條件約束。
types 的項目是 null。
備註
如需此 API 的詳細資訊,請參閱 Type.GetProperty 的補充 API 備註。
另請參閱
- PropertyInfo
- String
- BindingFlags
- Binder
- DefaultBinder
- ParameterModifier
- GetPropertyImpl(String, BindingFlags, Binder, Type, Type[], ParameterModifier[])
- GetProperties(BindingFlags)
適用於
GetProperty(String, Type, Type[], ParameterModifier[])
- 來源:
- Type.cs
- 來源:
- Type.cs
- 來源:
- Type.cs
搜尋指定的公用屬性,其參數符合指定的引數類型和修飾詞。
public:
System::Reflection::PropertyInfo ^ GetProperty(System::String ^ name, Type ^ returnType, cli::array <Type ^> ^ types, cli::array <System::Reflection::ParameterModifier> ^ modifiers);
public:
virtual System::Reflection::PropertyInfo ^ GetProperty(System::String ^ name, Type ^ returnType, cli::array <Type ^> ^ types, cli::array <System::Reflection::ParameterModifier> ^ modifiers);
public System.Reflection.PropertyInfo? GetProperty (string name, Type? returnType, Type[] types, System.Reflection.ParameterModifier[]? modifiers);
public System.Reflection.PropertyInfo GetProperty (string name, Type returnType, Type[] types, System.Reflection.ParameterModifier[] modifiers);
member this.GetProperty : string * Type * Type[] * System.Reflection.ParameterModifier[] -> System.Reflection.PropertyInfo
abstract member GetProperty : string * Type * Type[] * System.Reflection.ParameterModifier[] -> System.Reflection.PropertyInfo
override this.GetProperty : string * Type * Type[] * System.Reflection.ParameterModifier[] -> System.Reflection.PropertyInfo
Public Function GetProperty (name As String, returnType As Type, types As Type(), modifiers As ParameterModifier()) As PropertyInfo
參數
- name
- String
字串,包含要取得的公用屬性名稱。
- returnType
- Type
屬性的傳回類型。
- types
- Type[]
Type 物件的陣列,代表所要取得之索引屬性的參數數目、順序和類型。
-或-
用以取得未編製索引的屬性之 Type 類型的空陣列 (也就是,Type[] types = new Type[0])。
- modifiers
- ParameterModifier[]
ParameterModifier 物件的陣列,代表在 types 陣列中與對應項目關聯的屬性。 預設的繫結器不會處理這個參數。
傳回
物件,代表符合指定之需求的公用屬性 (如有找到),否則為 null。
實作
例外狀況
找到一個以上具有指定名稱,且符合指定引數類型和修飾詞的屬性。
types 的項目是 null。
範例
下列範例會 Type 取得對應至 MyPropertyClass的物件,並使用傳遞至 GetProperty 方法的自變數來擷取這個類別的索引屬性。
using namespace System;
using namespace System::Reflection;
public ref class MyPropertyClass
{
private:
array<int, 2>^ myPropertyArray;
public:
property int Item [int, int]
{
// Declare an indexer.
int get( int i, int j )
{
return myPropertyArray[ i,j ];
}
void set( int i, int j, int value )
{
myPropertyArray[ i,j ] = value;
}
}
};
int main()
{
try
{
Type^ myType = MyPropertyClass::typeid;
array<Type^>^myTypeArray = gcnew array<Type^>(2);
// Create an instance of the Type array representing the number, order
// and type of the parameters for the property.
myTypeArray->SetValue( int::typeid, 0 );
myTypeArray->SetValue( int::typeid, 1 );
// Search for the indexed property whose parameters match the
// specified argument types and modifiers.
PropertyInfo^ myPropertyInfo = myType->GetProperty( "Item", int::typeid, myTypeArray, nullptr );
Console::WriteLine( "{0}.{1} has a property type of {2}", myType->FullName, myPropertyInfo->Name, myPropertyInfo->PropertyType );
}
catch ( Exception^ ex )
{
Console::WriteLine( "An exception occurred {0}", ex->Message );
}
}
using System;
using System.Reflection;
public class MyPropertyClass
{
private readonly int [,] _myPropertyArray = new int[10,10];
// Declare an indexer.
public int this [int i,int j]
{
get
{
return _myPropertyArray[i,j];
}
set
{
_myPropertyArray[i,j] = value;
}
}
}
public class MyTypeClass
{
public static void Main()
{
try
{
Type myType=typeof(MyPropertyClass);
Type[] myTypeArray = new Type[2];
// Create an instance of the Type array representing the number, order
// and type of the parameters for the property.
myTypeArray.SetValue(typeof(int),0);
myTypeArray.SetValue(typeof(int),1);
// Search for the indexed property whose parameters match the
// specified argument types and modifiers.
PropertyInfo myPropertyInfo = myType.GetProperty("Item",
typeof(int),myTypeArray,null);
Console.WriteLine(myType.FullName + "." + myPropertyInfo.Name +
" has a property type of " + myPropertyInfo.PropertyType);
}
catch(Exception ex)
{
Console.WriteLine("An exception occurred " + ex.Message);
}
}
}
open System
type MyPropertyClass() =
let myPropertyArray = Array2D.zeroCreate<int> 10 10
// Declare an indexed property.
member _.Item
with get (i, j) =
myPropertyArray[i, j]
and set (i, j) value =
myPropertyArray[i, j] <- value
try
let myType = typeof<MyPropertyClass>
let myTypeArray = Array.zeroCreate<Type> 2
// Create an instance of the Type array representing the number, order
// and type of the parameters for the property.
myTypeArray.SetValue(typeof<int>, 0)
myTypeArray.SetValue(typeof<int>, 1)
// Search for the indexed property whose parameters match the
// specified argument types and modifiers.
let myPropertyInfo = myType.GetProperty("Item", typeof<int>, myTypeArray, null)
printfn $"{myType.FullName}.{myPropertyInfo.Name} has a property type of {myPropertyInfo.PropertyType}"
with ex ->
printfn $"An exception occurred {ex.Message}"
Imports System.Reflection
Public Class MyPropertyClass
Private myPropertyArray(9, 9) As Integer
' Declare an indexer.
Default Public Property Item(ByVal i As Integer, ByVal j As Integer) As Integer
Get
Return myPropertyArray(i, j)
End Get
Set(ByVal Value As Integer)
myPropertyArray(i, j) = Value
End Set
End Property
End Class
Public Class MyTypeClass
Public Shared Sub Main()
Try
Dim myType As Type = GetType(MyPropertyClass)
Dim myTypeArray(1) As Type
' Create an instance of a Type array representing the number, order
' and type of the parameters for the property.
myTypeArray.SetValue(GetType(Integer), 0)
myTypeArray.SetValue(GetType(Integer), 1)
' Search for the indexed property whose parameters match the
' specified argument types and modifiers.
Dim myPropertyInfo As PropertyInfo = myType.GetProperty("Item", _
GetType(Integer), myTypeArray, Nothing)
Console.WriteLine(myType.FullName + "." + myPropertyInfo.Name + _
" has a property type of " + myPropertyInfo.PropertyType.ToString())
Catch ex As Exception
Console.WriteLine("An exception occurred " + ex.Message.ToString())
End Try
End Sub
End Class
備註
如果屬性至少有一個存取子是公用的,則會將其視為公用。 否則,屬性會被視為私用屬性,而且您必須在Visual Basic中使用 BindingFlags.NonPublic | BindingFlags.Instance | BindingFlags.Static (,請使用 Or) 結合值來取得它。
雖然預設系結器不會處理 ParameterModifier 參數 (modifiers) ,但您可以使用抽象 System.Reflection.Binder 類來撰寫會處理 modifiers的自定義系結器。
ParameterModifier 只有在透過 COM Interop 呼叫時,才會使用,而且只會處理以傳址方式傳遞的參數。
搜尋 name 會區分大小寫。 搜尋包含公用靜態和公用實例屬性。
如果目前的 Type 代表建構的泛型型別,這個方法會傳回 PropertyInfo ,並將 型別參數取代為適當的型別自變數。
如果目前的 Type 代表泛型型別或泛型方法定義中的型別參數,這個方法會搜尋類別條件約束的屬性。
另請參閱
- PropertyInfo
- String
- DefaultBinder
- ParameterModifier
- GetPropertyImpl(String, BindingFlags, Binder, Type, Type[], ParameterModifier[])
- GetProperties(BindingFlags)
適用於
GetProperty(String, Type[])
- 來源:
- Type.cs
- 來源:
- Type.cs
- 來源:
- Type.cs
搜尋指定的公用屬性,其參數符合指定的引數類型。
public:
System::Reflection::PropertyInfo ^ GetProperty(System::String ^ name, cli::array <Type ^> ^ types);
public:
virtual System::Reflection::PropertyInfo ^ GetProperty(System::String ^ name, cli::array <Type ^> ^ types);
public System.Reflection.PropertyInfo? GetProperty (string name, Type[] types);
public System.Reflection.PropertyInfo GetProperty (string name, Type[] types);
member this.GetProperty : string * Type[] -> System.Reflection.PropertyInfo
abstract member GetProperty : string * Type[] -> System.Reflection.PropertyInfo
override this.GetProperty : string * Type[] -> System.Reflection.PropertyInfo
Public Function GetProperty (name As String, types As Type()) As PropertyInfo
參數
- name
- String
字串,包含要取得的公用屬性名稱。
- types
- Type[]
Type 物件的陣列,代表所要取得之索引屬性的參數數目、順序和類型。
-或-
用以取得未編製索引的屬性之 Type 類型的空陣列 (也就是,Type[] types = new Type[0])。
傳回
代表其參數符合指定之引數類型的公用屬性物件 (如有找到),否則為 null。
實作
例外狀況
找到一個以上具有指定名稱,且符合指定引數類型的屬性。
types 是多維的。
types 的項目是 null。
範例
下列範例會 Type 擷取使用者定義類別的物件、擷取該類別的屬性,並顯示傳遞給之自變數 GetProperty所指定的屬性名稱和類型。
using namespace System;
using namespace System::Reflection;
ref class MyClass1
{
private:
array<int, 2>^myArray;
public:
property int Item [int, int]
{
// Declare an indexer.
int get( int i, int j )
{
return myArray[ i,j ];
}
void set( int i, int j, int value )
{
myArray[ i,j ] = value;
}
}
};
int main()
{
try
{
// Get the Type object.
Type^ myType = MyClass1::typeid;
array<Type^>^myTypeArr = gcnew array<Type^>(2);
// Create an instance of a Type array.
myTypeArr->SetValue( int::typeid, 0 );
myTypeArr->SetValue( int::typeid, 1 );
// Get the PropertyInfo object for the indexed property Item, which has two integer parameters.
PropertyInfo^ myPropInfo = myType->GetProperty( "Item", myTypeArr );
// Display the property.
Console::WriteLine( "The {0} property exists in MyClass1.", myPropInfo );
}
catch ( NullReferenceException^ e )
{
Console::WriteLine( "An exception occurred." );
Console::WriteLine( "Source : {0}", e->Source );
Console::WriteLine( "Message : {0}", e->Message );
}
}
using System;
using System.Reflection;
class MyClass3
{
private readonly int[,] _myArray = { { 1, 2 }, { 3, 4 } };
// Declare an indexer.
public int this[int i, int j]
{
get
{
return _myArray[i, j];
}
set
{
_myArray[i, j] = value;
}
}
}
public class MyTypeClass3
{
public static void Main(string[] args)
{
try
{
// Get the Type object.
Type myType = typeof(MyClass3);
Type[] myTypeArr = new Type[2];
// Create an instance of a Type array.
myTypeArr.SetValue(typeof(int), 0);
myTypeArr.SetValue(typeof(int), 1);
// Get the PropertyInfo object for the indexed property Item, which has two integer parameters.
PropertyInfo myPropInfo = myType.GetProperty("Item", myTypeArr);
// Display the property.
Console.WriteLine("The {0} property exists in MyClass3.",
myPropInfo.ToString());
}
catch (NullReferenceException e)
{
Console.WriteLine("An exception occurred.");
Console.WriteLine("Source : {0}", e.Source);
Console.WriteLine("Message : {0}", e.Message);
}
}
}
open System
type MyClass1() =
let myArray = array2D [[1; 2]; [3; 4]]
// Declare an indexed property.
member _.Item
with get (i, j) =
myArray[i, j]
and set (i, j) value =
myArray[i, j] <- value
try
// Get the Type object.
let myType = typeof<MyClass1>
let myTypeArr = Array.zeroCreate<Type> 2
// Create an instance of a Type array.
myTypeArr.SetValue(typeof<int>, 0)
myTypeArr.SetValue(typeof<int>, 1)
// Get the PropertyInfo object for the indexed property Item, which has two integer parameters.
let myPropInfo = myType.GetProperty("Item", myTypeArr)
// Display the property.
printfn $"The {myPropInfo} property exists in MyClass1."
with :? NullReferenceException as e ->
printfn "An exception occurred."
printfn $"Source : {e.Source}"
printfn $"Message : {e.Message}"
Imports System.Reflection
Module Module1
Class MyClass1
Private myArray As Integer(,) = {{1, 2}, {3, 4}}
' Declare an indexer.
Default Public Property Item(ByVal i As Integer, ByVal j As Integer) As Integer
Get
Return myArray(i, j)
End Get
Set(ByVal Value As Integer)
myArray(i, j) = Value
End Set
End Property
End Class
Public Class MyTypeClass
Public Shared Sub Main()
Try
' Get the Type Object.
Dim myType As Type = GetType(MyClass1)
Dim myTypeArr(1) As Type
' Create an instance of a Type array.
myTypeArr.SetValue(GetType(Integer), 0)
myTypeArr.SetValue(GetType(Integer), 1)
' Get the PropertyInfo object for the indexed property Item, which has two integer parameters.
Dim myPropInfo As PropertyInfo = myType.GetProperty("Item", myTypeArr)
' Display the property.
Console.WriteLine("The {0} property exists in MyClass1.", myPropInfo.ToString())
Catch e As NullReferenceException
Console.WriteLine("An exception occurred.")
Console.WriteLine("Source : {0}", e.Source.ToString())
Console.WriteLine("Message : {0}", e.Message.ToString())
End Try
End Sub
End Class
End Module 'Module1
備註
如果屬性至少有一個存取子是公用的,則會將其視為公用。 否則,屬性會被視為私用屬性,而且您必須在Visual Basic中使用 BindingFlags.NonPublic | BindingFlags.Instance | BindingFlags.Static (,請使用 Or) 結合值來取得它。
搜尋 name 會區分大小寫。 搜尋包含公用靜態和公用實例屬性。
如果目前的 Type 代表建構的泛型型別,這個方法會傳回 PropertyInfo ,並將 型別參數取代為適當的型別自變數。
如果目前的 Type 代表泛型型別或泛型方法定義中的型別參數,這個方法會搜尋類別條件約束的屬性。
另請參閱
- PropertyInfo
- String
- DefaultBinder
- GetPropertyImpl(String, BindingFlags, Binder, Type, Type[], ParameterModifier[])
- GetProperties(BindingFlags)
適用於
GetProperty(String, Type, Type[])
- 來源:
- Type.cs
- 來源:
- Type.cs
- 來源:
- Type.cs
搜尋指定的公用屬性,其參數符合指定的引數類型。
public:
System::Reflection::PropertyInfo ^ GetProperty(System::String ^ name, Type ^ returnType, cli::array <Type ^> ^ types);
public:
virtual System::Reflection::PropertyInfo ^ GetProperty(System::String ^ name, Type ^ returnType, cli::array <Type ^> ^ types);
public System.Reflection.PropertyInfo? GetProperty (string name, Type? returnType, Type[] types);
public System.Reflection.PropertyInfo GetProperty (string name, Type returnType, Type[] types);
member this.GetProperty : string * Type * Type[] -> System.Reflection.PropertyInfo
abstract member GetProperty : string * Type * Type[] -> System.Reflection.PropertyInfo
override this.GetProperty : string * Type * Type[] -> System.Reflection.PropertyInfo
Public Function GetProperty (name As String, returnType As Type, types As Type()) As PropertyInfo
參數
- name
- String
字串,包含要取得的公用屬性名稱。
- returnType
- Type
屬性的傳回類型。
- types
- Type[]
Type 物件的陣列,代表所要取得之索引屬性的參數數目、順序和類型。
-或-
用以取得未編製索引的屬性之 Type 類型的空陣列 (也就是,Type[] types = new Type[0])。
傳回
代表其參數符合指定之引數類型的公用屬性物件 (如有找到),否則為 null。
實作
例外狀況
找到一個以上具有指定名稱,且符合指定引數類型的屬性。
types 是多維的。
types 的項目是 null。
備註
如果屬性至少有一個存取子是公用的,則會將其視為公用。 否則,屬性會被視為私用屬性,而且您必須在Visual Basic中使用 BindingFlags.NonPublic | BindingFlags.Instance | BindingFlags.Static (,請使用 Or) 結合值來取得它。
搜尋 name 會區分大小寫。 搜尋包含公用靜態和公用實例屬性。
如果目前的 Type 代表建構的泛型型別,這個方法會傳回 PropertyInfo ,並將 型別參數取代為適當的型別自變數。
如果目前的 Type 代表泛型型別或泛型方法定義中的型別參數,這個方法會搜尋類別條件約束的屬性。
另請參閱
- PropertyInfo
- String
- DefaultBinder
- GetPropertyImpl(String, BindingFlags, Binder, Type, Type[], ParameterModifier[])
- GetProperties(BindingFlags)
適用於
GetProperty(String, BindingFlags)
- 來源:
- Type.cs
- 來源:
- Type.cs
- 來源:
- Type.cs
使用指定的繫結條件約束搜尋指定的屬性。
public:
virtual System::Reflection::PropertyInfo ^ GetProperty(System::String ^ name, System::Reflection::BindingFlags bindingAttr);
public System.Reflection.PropertyInfo? GetProperty (string name, System.Reflection.BindingFlags bindingAttr);
public System.Reflection.PropertyInfo GetProperty (string name, System.Reflection.BindingFlags bindingAttr);
abstract member GetProperty : string * System.Reflection.BindingFlags -> System.Reflection.PropertyInfo
override this.GetProperty : string * System.Reflection.BindingFlags -> System.Reflection.PropertyInfo
Public Function GetProperty (name As String, bindingAttr As BindingFlags) As PropertyInfo
參數
- name
- String
字串,包含要取得的屬性名稱。
傳回
代表符合指定之需求屬性的物件 (如有找到);否則為 null。
實作
例外狀況
找到一個以上的屬性,其具有指定名稱,且符合指定繫結條件約束。
name 為 null。
範例
下列範例會擷取使用者定義類別的類型、擷取該類別的屬性,並根據指定的系結條件約束顯示屬性名稱。
using namespace System;
using namespace System::Reflection;
ref class MyClass
{
private:
int myProperty;
public:
property int MyProperty
{
// Declare MyProperty.
int get()
{
return myProperty;
}
void set( int value )
{
myProperty = value;
}
}
};
int main()
{
try
{
// Get Type object of MyClass.
Type^ myType = MyClass::typeid;
// Get the PropertyInfo by passing the property name and specifying the BindingFlags.
PropertyInfo^ myPropInfo = myType->GetProperty( "MyProperty", static_cast<BindingFlags>(BindingFlags::Public | BindingFlags::Instance) );
// Display Name property to console.
Console::WriteLine( "{0} is a property of MyClass.", myPropInfo->Name );
}
catch ( NullReferenceException^ e )
{
Console::WriteLine( "MyProperty does not exist in MyClass. {0}", e->Message );
}
}
using System;
using System.Reflection;
class MyClass2
{
// Declare MyProperty.
public int MyProperty { get; set; }
}
public class MyTypeClass2
{
public static void Main(string[] args)
{
try
{
// Get Type object of MyClass2.
Type myType = typeof(MyClass2);
// Get the PropertyInfo by passing the property name and specifying the BindingFlags.
PropertyInfo myPropInfo = myType.GetProperty(
"MyProperty",
BindingFlags.Public | BindingFlags.Instance
);
// Display Name property to console.
Console.WriteLine("{0} is a property of MyClass2.", myPropInfo.Name);
}
catch (NullReferenceException e)
{
Console.WriteLine("MyProperty does not exist in MyClass2." + e.Message);
}
}
}
open System
open System.Reflection
type MyClass() =
let mutable myProperty = 0
// Declare MyProperty.
member _.MyProperty
with get () =
myProperty
and set (value) =
myProperty <- value
try
// Get Type object of MyClass.
let myType = typeof<MyClass>
// Get the PropertyInfo by passing the property name and specifying the BindingFlags.
let myPropInfo = myType.GetProperty("MyProperty", BindingFlags.Public ||| BindingFlags.Instance)
// Display Name property to console.
printfn $"{myPropInfo.Name} is a property of MyClass."
with :? NullReferenceException as e ->
printfn $"MyProperty does not exist in MyClass.{e.Message}"
Imports System.Reflection
Module Module1
Public Class MyClass1
Private myProperty1 As Integer
' Declare MyProperty.
Public Property MyProperty() As Integer
Get
Return myProperty1
End Get
Set(ByVal Value As Integer)
myProperty1 = Value
End Set
End Property
Public Shared Sub Main()
Try
' Get a Type object corresponding to MyClass.
Dim myType As Type = GetType(MyClass1)
' Get a PropertyInfo object by passing property name and specifying BindingFlags.
Dim myPropInfo As PropertyInfo = myType.GetProperty("MyProperty", BindingFlags.Public Or BindingFlags.Instance)
' Display the Name property.
Console.WriteLine("{0} is a property of MyClass.", myPropInfo.Name)
Catch e As NullReferenceException
Console.WriteLine("MyProperty does not exist in MyClass.", e.Message.ToString())
End Try
End Sub
End Class
End Module 'Module1
另請參閱
- PropertyInfo
- String
- BindingFlags
- DefaultBinder
- GetPropertyImpl(String, BindingFlags, Binder, Type, Type[], ParameterModifier[])
- GetProperties(BindingFlags)
適用於
GetProperty(String)
- 來源:
- Type.cs
- 來源:
- Type.cs
- 來源:
- Type.cs
搜尋具有指定名稱的公用屬性。
public:
System::Reflection::PropertyInfo ^ GetProperty(System::String ^ name);
public:
virtual System::Reflection::PropertyInfo ^ GetProperty(System::String ^ name);
public System.Reflection.PropertyInfo? GetProperty (string name);
public System.Reflection.PropertyInfo GetProperty (string name);
member this.GetProperty : string -> System.Reflection.PropertyInfo
abstract member GetProperty : string -> System.Reflection.PropertyInfo
override this.GetProperty : string -> System.Reflection.PropertyInfo
Public Function GetProperty (name As String) As PropertyInfo
參數
- name
- String
字串,包含要取得的公用屬性名稱。
傳回
物件,代表具有指定之名稱的公用屬性 (如有找到),否則為 null。
實作
例外狀況
找到一個以上具有指定名稱的屬性。
name 為 null。
範例
下列範例會 Type 擷取使用者定義類別的物件、擷取該類別的屬性,並顯示屬性名稱。
using namespace System;
using namespace System::Reflection;
ref class MyClass
{
private:
int myProperty;
public:
property int MyProperty
{
// Declare MyProperty.
int get()
{
return myProperty;
}
void set( int value )
{
myProperty = value;
}
}
};
int main()
{
try
{
// Get the Type object corresponding to MyClass.
Type^ myType = MyClass::typeid;
// Get the PropertyInfo object by passing the property name.
PropertyInfo^ myPropInfo = myType->GetProperty( "MyProperty" );
// Display the property name.
Console::WriteLine( "The {0} property exists in MyClass.", myPropInfo->Name );
}
catch ( NullReferenceException^ e )
{
Console::WriteLine( "The property does not exist in MyClass. {0}", e->Message );
}
}
using System;
using System.Reflection;
class MyClass1
{
// Declare MyProperty.
public int MyProperty { get; set; }
}
public class MyTypeClass1
{
public static void Main(string[] args)
{
try
{
// Get the Type object corresponding to MyClass1.
Type myType = typeof(MyClass1);
// Get the PropertyInfo object by passing the property name.
PropertyInfo myPropInfo = myType.GetProperty("MyProperty");
// Display the property name.
Console.WriteLine("The {0} property exists in MyClass1.", myPropInfo.Name);
}
catch (NullReferenceException e)
{
Console.WriteLine("The property does not exist in MyClass1." + e.Message);
}
}
}
open System
type MyClass() =
let mutable myProperty = 0
// Declare MyProperty.
member _.MyProperty
with get () =
myProperty
and set (value) =
myProperty <- value
try
// Get the Type object corresponding to MyClass.
let myType = typeof<MyClass>
// Get the PropertyInfo object by passing the property name.
let myPropInfo = myType.GetProperty "MyProperty"
// Display the property name.
printfn $"The {myPropInfo.Name} property exists in MyClass."
with :? NullReferenceException as e ->
printfn $"The property does not exist in MyClass.{e.Message}"
Imports System.Reflection
Class MyClass1
Private myProperty1 As Integer
' Declare MyProperty.
Public Property MyProperty() As Integer
Get
Return myProperty1
End Get
Set(ByVal Value As Integer)
myProperty1 = Value
End Set
End Property
End Class
Public Class MyTypeClass
Public Shared Sub Main(ByVal args() As String)
Try
' Get Type Object corresponding to MyClass.
Dim myType As Type = GetType(MyClass1)
' Get PropertyInfo object by passing property name.
Dim myPropInfo As PropertyInfo = myType.GetProperty("MyProperty")
' Display Name property to console.
Console.WriteLine("The {0} property exists in MyClass.", myPropInfo.Name)
Catch e As NullReferenceException
Console.WriteLine("The property does not exist in MyClass.", e.Message.ToString())
End Try
End Sub
End Class
備註
如需此 API 的詳細資訊,請參閱 Type.GetProperty 的補充 API 備註。
另請參閱
- PropertyInfo
- String
- DefaultBinder
- GetPropertyImpl(String, BindingFlags, Binder, Type, Type[], ParameterModifier[])
- GetProperties(BindingFlags)
適用於
GetProperty(String, Type)
- 來源:
- Type.cs
- 來源:
- Type.cs
- 來源:
- Type.cs
搜尋具有指定名稱和傳回類型的公用屬性。
public:
System::Reflection::PropertyInfo ^ GetProperty(System::String ^ name, Type ^ returnType);
public:
virtual System::Reflection::PropertyInfo ^ GetProperty(System::String ^ name, Type ^ returnType);
public System.Reflection.PropertyInfo? GetProperty (string name, Type? returnType);
public System.Reflection.PropertyInfo GetProperty (string name, Type returnType);
member this.GetProperty : string * Type -> System.Reflection.PropertyInfo
abstract member GetProperty : string * Type -> System.Reflection.PropertyInfo
override this.GetProperty : string * Type -> System.Reflection.PropertyInfo
Public Function GetProperty (name As String, returnType As Type) As PropertyInfo
參數
- name
- String
字串,包含要取得的公用屬性名稱。
- returnType
- Type
屬性的傳回類型。
傳回
物件,代表具有指定之名稱的公用屬性 (如有找到),否則為 null。
實作
例外狀況
找到一個以上具有指定名稱的屬性。
name 為 null 或 returnType 為 null。
範例
下列範例會定義具有一個屬性的類別,並擷取屬性的名稱和類型。
using namespace System;
using namespace System::Reflection;
ref class MyClass1
{
private:
String^ myMessage;
public:
property String^ MyProperty1
{
String^ get()
{
return myMessage;
}
void set( String^ value )
{
myMessage = value;
}
}
};
int main()
{
try
{
Type^ myType = MyClass1::typeid;
// Get the PropertyInfo Object* representing MyProperty1.
PropertyInfo^ myStringProperties1 = myType->GetProperty( "MyProperty1", String::typeid );
Console::WriteLine( "The name of the first property of MyClass1 is {0}.", myStringProperties1->Name );
Console::WriteLine( "The type of the first property of MyClass1 is {0}.", myStringProperties1->PropertyType );
}
catch ( ArgumentNullException^ e )
{
Console::WriteLine( "ArgumentNullException : {0}", e->Message );
}
catch ( AmbiguousMatchException^ e )
{
Console::WriteLine( "AmbiguousMatchException : {0}", e->Message );
}
catch ( NullReferenceException^ e )
{
Console::WriteLine( "Source : {0}", e->Source );
Console::WriteLine( "Message : {0}", e->Message );
}
//Output:
//The name of the first property of MyClass1 is MyProperty1.
//The type of the first property of MyClass1 is System.String.
}
using System;
using System.Reflection;
class MyPropertyTypeClass
{
public string MyProperty1 { get; set; } = "Hello World.";
}
class TestClass
{
static void Main()
{
try
{
Type myType = typeof(MyPropertyTypeClass);
// Get the PropertyInfo object representing MyProperty1.
PropertyInfo myStringProperties1 = myType.GetProperty("MyProperty1", typeof(string));
Console.WriteLine("The name of the first property of MyPropertyTypeClass is {0}.",
myStringProperties1.Name);
Console.WriteLine("The type of the first property of MyPropertyTypeClass is {0}.",
myStringProperties1.PropertyType);
}
catch (ArgumentNullException e)
{
Console.WriteLine("ArgumentNullException :" + e.Message);
}
catch (AmbiguousMatchException e)
{
Console.WriteLine("AmbiguousMatchException :" + e.Message);
}
catch (NullReferenceException e)
{
Console.WriteLine("Source : {0}", e.Source);
Console.WriteLine("Message : {0}", e.Message);
}
//Output:
//The name of the first property of MyPropertyTypeClass is MyProperty1.
//The type of the first property of MyPropertyTypeClass is System.String.
}
}
open System
open System.Reflection
type MyClass1() =
let mutable myMessage = "Hello World."
member _.MyProperty1
with get () =
myMessage
and set (value) =
myMessage <- value
try
let myType = typeof<MyClass1>
// Get the PropertyInfo object representing MyProperty1.
let myStringProperties1 = myType.GetProperty("MyProperty1", typeof<string>)
printfn $"The name of the first property of MyClass1 is {myStringProperties1.Name}."
printfn $"The type of the first property of MyClass1 is {myStringProperties1.PropertyType}."
with
| :? ArgumentNullException as e ->
printfn $"ArgumentNullException :{e.Message}"
| :? AmbiguousMatchException as e ->
printfn $"AmbiguousMatchException :{e.Message}"
| :? NullReferenceException as e ->
printfn $"Source : {e.Source}"
printfn $"Message : {e.Message}"
// Output:
// The name of the first property of MyClass1 is MyProperty1.
// The type of the first property of MyClass1 is System.String.
Imports System.Reflection
Class MyClass1
Private myMessage As [String] = "Hello World."
Public Property MyProperty1() As String
Get
Return myMessage
End Get
Set(ByVal Value As String)
myMessage = Value
End Set
End Property
End Class
Class TestClass
Shared Sub Main()
Try
Dim myType As Type = GetType(MyClass1)
' Get the PropertyInfo object representing MyProperty1.
Dim myStringProperties1 As PropertyInfo = myType.GetProperty("MyProperty1", GetType(String))
Console.WriteLine("The name of the first property of MyClass1 is {0}.", myStringProperties1.Name)
Console.WriteLine("The type of the first property of MyClass1 is {0}.", myStringProperties1.PropertyType.ToString())
Catch e As ArgumentNullException
Console.WriteLine("ArgumentNullException :" + e.Message.ToString())
Catch e As AmbiguousMatchException
Console.WriteLine("AmbiguousMatchException :" + e.Message.ToString())
Catch e As NullReferenceException
Console.WriteLine("Source : {0}", e.Source.ToString())
Console.WriteLine("Message : {0}", e.Message.ToString())
End Try
'Output:
'The name of the first property of MyClass1 is MyProperty1.
'The type of the first property of MyClass1 is System.String.
End Sub
End Class
備註
如果屬性至少有一個存取子是公用的,則會將其視為公用。 否則,屬性會被視為私用屬性,而且您必須在Visual Basic中使用 BindingFlags.NonPublic | BindingFlags.Instance | BindingFlags.Static (,請使用 Or) 結合值來取得它。
搜尋 name 會區分大小寫。 搜尋包含公用靜態和公用實例屬性。
如果目前的 Type 代表建構的泛型型別,這個方法會傳回 PropertyInfo ,並將 型別參數取代為適當的型別自變數。
如果目前的 Type 代表泛型型別或泛型方法定義中的型別參數,這個方法會搜尋類別條件約束的屬性。
另請參閱
- PropertyInfo
- String
- DefaultBinder
- GetPropertyImpl(String, BindingFlags, Binder, Type, Type[], ParameterModifier[])
- GetProperties(BindingFlags)