MethodBase.GetMethodBody 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。
在衍生類別中覆寫時，取得 MethodBody 物件，其提供對目前方法之 MSIL 資料流、區域變數和例外狀況的存取。
public:
virtual System::Reflection::MethodBody ^ GetMethodBody();public virtual System.Reflection.MethodBody? GetMethodBody ();public virtual System.Reflection.MethodBody GetMethodBody ();abstract member GetMethodBody : unit -> System.Reflection.MethodBody
override this.GetMethodBody : unit -> System.Reflection.MethodBodyPublic Overridable Function GetMethodBody () As MethodBody傳回
MethodBody 物件，其提供對目前方法之 MSIL 資料流、區域變數和例外狀況的存取。
例外狀況
除非在衍生類別中覆寫這個方法，否則該方法無效。
範例
下列程式代碼範例會定義名為 MethodBodyExample 的測試方法，並顯示其局部變數資訊和例外狀況處理子句。 方法 MethodBase.GetMethodBody 可用來取得 MethodBody 測試方法的物件。
屬性 LocalVariables 可用來取得物件清單 LocalVariableInfo ，並顯示其類型和索引順序。 屬性 ExceptionHandlingClauses 是用來取得例外狀況處理子句的清單。
注意
並非所有計算機語言都可以產生 ExceptionHandlingClauseOptions.Filter 子句。 Visual Basic 範例會使用 Visual Basic When 運算式顯示篩選子句，該運算式會從其他語言的範例中省略。
#using <System.dll>
using namespace System;
using namespace System::Reflection;
public ref class Example
{
// The Main method contains code to analyze this method, using
// the properties and methods of the MethodBody class.
public:
void MethodBodyExample(Object^ arg)
{
// Define some local variables. In addition to these variables,
// the local variable list includes the variables scoped to
// the catch clauses.
int var1 = 42;
String^ var2 = "Forty-two";
try
{
// Depending on the input value, throw an ArgumentException or
// an ArgumentNullException to test the Catch clauses.
if (arg == nullptr)
{
throw gcnew ArgumentNullException("The argument cannot " +
"be null.");
}
if (arg->GetType() == String::typeid)
{
throw gcnew ArgumentException("The argument cannot " +
"be a string.");
}
}
// There is no Filter clause in this code example. See the Visual
// Basic code for an example of a Filter clause.
// This catch clause handles the ArgumentException class, and
// any other class derived from Exception.
catch (ArgumentException^ ex)
{
Console::WriteLine("Ordinary exception-handling clause caught:" +
" {0}", ex->GetType());
}
finally
{
var1 = 3033;
var2 = "Another string.";
}
}
};
int main()
{
// Get method body information.
MethodInfo^ mi =
Example::typeid->GetMethod("MethodBodyExample");
MethodBody^ mb = mi->GetMethodBody();
Console::WriteLine("\r\nMethod: {0}", mi);
// Display the general information included in the
// MethodBody object.
Console::WriteLine(" Local variables are initialized: {0}",
mb->InitLocals);
Console::WriteLine(" Maximum number of items on the operand " +
"stack: {0}", mb->MaxStackSize);
// Display information about the local variables in the
// method body.
Console::WriteLine();
for each (LocalVariableInfo^ lvi in mb->LocalVariables)
{
Console::WriteLine("Local variable: {0}", lvi);
}
// Display exception handling clauses.
Console::WriteLine();
for each(ExceptionHandlingClause^ exhc in mb->ExceptionHandlingClauses)
{
Console::WriteLine(exhc->Flags.ToString());
// The FilterOffset property is meaningful only for Filter
// clauses. The CatchType property is not meaningful for
// Filter or Finally clauses.
switch(exhc->Flags)
{
case ExceptionHandlingClauseOptions::Filter:
Console::WriteLine(" Filter Offset: {0}",
exhc->FilterOffset);
break;
case ExceptionHandlingClauseOptions::Finally:
break;
default:
Console::WriteLine(" Type of exception: {0}",
exhc->CatchType);
break;
}
Console::WriteLine(" Handler Length: {0}",
exhc->HandlerLength);
Console::WriteLine(" Handler Offset: {0}",
exhc->HandlerOffset);
Console::WriteLine(" Try Block Length: {0}", exhc->TryLength);
Console::WriteLine(" Try Block Offset: {0}", exhc->TryOffset);
}
}
//This code example produces output similar to the following:
//
//Method: Void MethodBodyExample(System.Object)
// Local variables are initialized: False
// Maximum number of items on the operand stack: 4
//
//Local variable: System.ArgumentException (0)
//Local variable: System.String (1)
//Local variable: System.Int32 (2)
//Clause
// Type of exception: System.ArgumentException
// Handler Length: 29
// Handler Offset: 78
// Try Block Length: 65
// Try Block Offset: 13
//Finally
// Handler Length: 13
// Handler Offset: 113
// Try Block Length: 100
// Try Block Offset: 13
using System;
using System.Reflection;
public class Example
{
public static void Main()
{
// Get method body information.
MethodInfo mi = typeof(Example).GetMethod("MethodBodyExample");
MethodBody mb = mi.GetMethodBody();
Console.WriteLine("\r\nMethod: {0}", mi);
// Display the general information included in the
// MethodBody object.
Console.WriteLine(" Local variables are initialized: {0}",
mb.InitLocals);
Console.WriteLine(" Maximum number of items on the operand stack: {0}",
mb.MaxStackSize);
// Display information about the local variables in the
// method body.
Console.WriteLine();
foreach (LocalVariableInfo lvi in mb.LocalVariables)
{
Console.WriteLine("Local variable: {0}", lvi);
}
// Display exception handling clauses.
Console.WriteLine();
foreach (ExceptionHandlingClause ehc in mb.ExceptionHandlingClauses)
{
Console.WriteLine(ehc.Flags.ToString());
// The FilterOffset property is meaningful only for Filter
// clauses. The CatchType property is not meaningful for
// Filter or Finally clauses.
switch (ehc.Flags)
{
case ExceptionHandlingClauseOptions.Filter:
Console.WriteLine(" Filter Offset: {0}",
ehc.FilterOffset);
break;
case ExceptionHandlingClauseOptions.Finally:
break;
default:
Console.WriteLine(" Type of exception: {0}",
ehc.CatchType);
break;
}
Console.WriteLine(" Handler Length: {0}", ehc.HandlerLength);
Console.WriteLine(" Handler Offset: {0}", ehc.HandlerOffset);
Console.WriteLine(" Try Block Length: {0}", ehc.TryLength);
Console.WriteLine(" Try Block Offset: {0}", ehc.TryOffset);
}
}
// The Main method contains code to analyze this method, using
// the properties and methods of the MethodBody class.
public void MethodBodyExample(object arg)
{
// Define some local variables. In addition to these variables,
// the local variable list includes the variables scoped to
// the catch clauses.
int var1 = 42;
string var2 = "Forty-two";
try
{
// Depending on the input value, throw an ArgumentException or
// an ArgumentNullException to test the Catch clauses.
if (arg == null)
{
throw new ArgumentNullException("The argument cannot be null.");
}
if (arg.GetType() == typeof(string))
{
throw new ArgumentException("The argument cannot be a string.");
}
}
// This filter clause selects only exceptions that derive
// from the ArgumentException class.
// Other exceptions, including ArgumentException itself,
// are not handled by this filter clause.
catch (ArgumentException ex) when (ex.GetType().IsSubclassOf(typeof(ArgumentException)))
{
Console.WriteLine("Filter clause caught: {0}", ex.GetType());
}
// This catch clause handles the ArgumentException class, and
// any other class derived from Exception.
catch(Exception ex)
{
Console.WriteLine("Ordinary exception-handling clause caught: {0}",
ex.GetType());
}
finally
{
var1 = 3033;
var2 = "Another string.";
}
}
}
// This code example produces output similar to the following:
//
//Method: Void MethodBodyExample(System.Object)
// Local variables are initialized: True
// Maximum number of items on the operand stack: 2
//
//Local variable: System.Int32 (0)
//Local variable: System.String (1)
//Local variable: System.Exception (2)
//Local variable: System.Boolean (3)
//
//Filter
// Filter Offset: 71
// Handler Length: 23
// Handler Offset: 116
// Try Block Length: 61
// Try Block Offset: 10
//Clause
// Type of exception: System.Exception
// Handler Length: 21
// Handler Offset: 70
// Try Block Length: 61
// Try Block Offset: 9
//Finally
// Handler Length: 14
// Handler Offset: 94
// Try Block Length: 85
// Try Block Offset: 9
Imports System.Reflection
Public Class Example
Public Shared Sub Main()
' Demonstrate the effect of the Visual Basic When keyword, which
' generates a Filter clause in the Try block.
Dim e As New Example()
Console.WriteLine()
e.MethodBodyExample("String argument")
e.MethodBodyExample(Nothing)
' Get method body information.
Dim mi As MethodInfo = _
GetType(Example).GetMethod("MethodBodyExample")
Dim mb As MethodBody = mi.GetMethodBody()
Console.WriteLine(vbCrLf & "Method: {0}", mi)
' Display the general information included in the
' MethodBody object.
Console.WriteLine(" Local variables are initialized: {0}", _
mb.InitLocals)
Console.WriteLine(" Maximum number of items on the operand stack: {0}", _
mb.MaxStackSize)
' Display information about the local variables in the
' method body.
Console.WriteLine()
For Each lvi As LocalVariableInfo In mb.LocalVariables
Console.WriteLine("Local variable: {0}", lvi)
Next
' Display exception handling clauses.
Console.WriteLine()
For Each ehc As ExceptionHandlingClause In mb.ExceptionHandlingClauses
Console.WriteLine(ehc.Flags.ToString())
' The FilterOffset property is meaningful only for Filter
' clauses. The CatchType property is not meaningful for
' Filter or Finally clauses.
Select Case ehc.Flags
Case ExceptionHandlingClauseOptions.Filter
Console.WriteLine(" Filter Offset: {0}", _
ehc.FilterOffset)
Case ExceptionHandlingClauseOptions.Finally
Case Else
Console.WriteLine(" Type of exception: {0}", _
ehc.CatchType)
End Select
Console.WriteLine(" Handler Length: {0}", ehc.HandlerLength)
Console.WriteLine(" Handler Offset: {0}", ehc.HandlerOffset)
Console.WriteLine(" Try Block Length: {0}", ehc.TryLength)
Console.WriteLine(" Try Block Offset: {0}", ehc.TryOffset)
Next
End Sub
' This test method is executed at the beginning of Main, to show
' how the Filter clause works. The Filter clause is generated by
' a Visual Basic When expression. If arg is Nothing, this method
' throws ArgumentNullException, which is caught by the filter
' clause. If arg is a string, the method throws ArgumentException,
' which does not match the filter clause.
'
' Sub Main also contains code to analyze this method, using
' the properties and methods of the MethodBody class.
Public Sub MethodBodyExample(ByVal arg As Object)
' Define some local variables. In addition to these variables,
' the local variable list includes the variables scoped to
' the catch clauses.
Dim var1 As Integer = 42
Dim var2 As String = "Forty-two"
Try
' Depending on the input value, throw an ArgumentException or
' an ArgumentNullException to test the Catch clauses.
'
If arg Is Nothing Then
Throw New ArgumentNullException("The argument cannot be Nothing.")
End If
If arg.GetType() Is GetType(String) Then
Throw New ArgumentException("The argument cannot be a string.")
End If
' The When expression makes this a filter clause. The expression
' selects only exceptions that derive from the ArgumentException
' class. Other exceptions, including ArgumentException itself,
' are not handled by this filter clause.
Catch ex As ArgumentException _
When ex.GetType().IsSubclassOf(GetType(ArgumentException))
Console.WriteLine("Filter clause caught: {0}", ex.GetType())
' This catch clause handles the ArgumentException class, and
' any other class derived from Exception.
Catch ex As Exception
Console.WriteLine("Ordinary exception-handling clause caught: {0}", _
ex.GetType())
Finally
var1 = 3033
var2 = "Another string."
End Try
End Sub
End Class
' This code example produces output similar to the following:
'
'Ordinary exception-handling clause caught: System.ArgumentException
'Filter clause caught: System.ArgumentNullException
'
'Method: Void MethodBodyExample(System.Object)
' Local variables are initialized: True
' Maximum number of items on the operand stack: 3
'
'Local variable: System.Int32 (0)
'Local variable: System.String (1)
'Local variable: System.ArgumentException (2)
'Local variable: System.Exception (3)
'
'Filter
' Filter Offset: 0
' Handler Length: 19
' Handler Offset: 99
' Try Block Length: 45
' Try Block Offset: 9
'Clause
' Type of exception: System.Exception
' Handler Length: 25
' Handler Offset: 118
' Try Block Length: 45
' Try Block Offset: 9
'Finally
' Handler Length: 13
' Handler Offset: 153
' Try Block Length: 144
' Try Block Offset: 9
備註
您不需要覆寫 GetMethodBody 才能使用它。 您可以在和 ConstructorInfo 物件上MethodInfo呼叫 GetMethodBody 方法，因為方法會在這些類別的運行時間版本中覆寫。 例如，類別的 MethodInfo 運行時間版本衍生自 MethodInfo 類別，而該類別又衍生自 MethodBase 類別。
