TypeDescriptor.GetProperties Method

Reference

Definition

Namespace:: System.ComponentModel

Assembly:: System.ComponentModel.TypeConverter.dll

Assembly:: System.dll

Assembly:: netstandard.dll

Package:: System.ComponentModel.TypeConverter v4.3.0

Important

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Returns the collection of properties on a component or type.

Overloads

GetProperties(Object)	Returns the collection of properties for a specified component.
GetProperties(Type)	Returns the collection of properties for a specified type of component.
GetProperties(Object, Attribute[])	Returns the collection of properties for a specified component using a specified array of attributes as a filter.
GetProperties(Object, Boolean)	Returns the collection of properties for a specified component using the default type descriptor.
GetProperties(Type, Attribute[])	Returns the collection of properties for a specified type of component using a specified array of attributes as a filter.
GetProperties(Object, Attribute[], Boolean)	Returns the collection of properties for a specified component using a specified array of attributes as a filter and using a custom type descriptor.

GetProperties(Object)

Source:: TypeDescriptor.cs

Source:: TypeDescriptor.cs

Source:: TypeDescriptor.cs

Returns the collection of properties for a specified component.

public:
 static System::ComponentModel::PropertyDescriptorCollection ^ GetProperties(System::Object ^ component);

public static System.ComponentModel.PropertyDescriptorCollection GetProperties (object component);

static member GetProperties : obj -> System.ComponentModel.PropertyDescriptorCollection

Public Shared Function GetProperties (component As Object) As PropertyDescriptorCollection

Parameters

component: Object

A component to get the properties for.

Returns

PropertyDescriptorCollection

A PropertyDescriptorCollection with the properties for the specified component.

Exceptions

NotSupportedException

component is a cross-process remoted object.

Examples

The following code example demonstrates the use of the GetProperties method to access the properties of a control. This code example is part of a larger example provided for the ComponentDesigner class.

// This is the shadowed property on the designer.
// This value will be serialized instead of the 
// value of the control's property.
public Color BackColor
{
    get
    {
        return (Color)ShadowProperties["BackColor"];
    }
    set
    {
        if (this.changeService != null)
        {
            PropertyDescriptor backColorDesc =
                TypeDescriptor.GetProperties(this.Control)["BackColor"];

            this.changeService.OnComponentChanging(
                this.Control,
                backColorDesc);

            this.ShadowProperties["BackColor"] = value;

            this.changeService.OnComponentChanged(
                this.Control,
                backColorDesc,
                null,
                null);
        }
    }
}

' This is the shadowed property on the designer.
' This value will be serialized instead of the 
' value of the control's property.

Public Property BackColor() As Color
    Get
        Return CType(ShadowProperties("BackColor"), Color)
    End Get
    Set(ByVal value As Color)
        If (Me.changeService IsNot Nothing) Then
            Dim backColorDesc As PropertyDescriptor = TypeDescriptor.GetProperties(Me.Control)("BackColor")

            Me.changeService.OnComponentChanging(Me.Control, backColorDesc)

            Me.ShadowProperties("BackColor") = value

            Me.changeService.OnComponentChanged(Me.Control, backColorDesc, Nothing, Nothing)
        End If
    End Set
End Property

Remarks

The properties for a component can differ from the properties of a class, because the site can add or remove properties if the component is sited.

If the component parameter is null, an empty collection is returned.

The order of the returned collection is not guaranteed to be identical between calls, so always order it before use.

Applies to

GetProperties(Type)

Source:: TypeDescriptor.cs

Source:: TypeDescriptor.cs

Source:: TypeDescriptor.cs

Returns the collection of properties for a specified type of component.

public:
 static System::ComponentModel::PropertyDescriptorCollection ^ GetProperties(Type ^ componentType);

public static System.ComponentModel.PropertyDescriptorCollection GetProperties (Type componentType);

static member GetProperties : Type -> System.ComponentModel.PropertyDescriptorCollection

Public Shared Function GetProperties (componentType As Type) As PropertyDescriptorCollection

Parameters

componentType: Type

A Type that represents the component to get properties for.

Returns

PropertyDescriptorCollection

A PropertyDescriptorCollection with the properties for a specified type of component.

Remarks

Call this version of this method only when you do not have an instance of the object.

If the componentType parameter is null, an empty collection is returned.

The order of the returned collection is not guaranteed to be identical between calls, so always order it before use.

Applies to

GetProperties(Object, Attribute[])

Source:: TypeDescriptor.cs

Source:: TypeDescriptor.cs

Source:: TypeDescriptor.cs

Returns the collection of properties for a specified component using a specified array of attributes as a filter.

public:
 static System::ComponentModel::PropertyDescriptorCollection ^ GetProperties(System::Object ^ component, cli::array <Attribute ^> ^ attributes);

public static System.ComponentModel.PropertyDescriptorCollection GetProperties (object component, Attribute[] attributes);

public static System.ComponentModel.PropertyDescriptorCollection GetProperties (object component, Attribute[]? attributes);

static member GetProperties : obj * Attribute[] -> System.ComponentModel.PropertyDescriptorCollection

Public Shared Function GetProperties (component As Object, attributes As Attribute()) As PropertyDescriptorCollection

Parameters

component: Object

A component to get the properties for.

attributes: Attribute[]

An array of type Attribute to use as a filter.

Returns

PropertyDescriptorCollection

A PropertyDescriptorCollection with the properties that match the specified attributes for the specified component.

Exceptions

NotSupportedException

component is a cross-process remoted object.

Examples

The following code example demonstrates how to implement the GetProperties method. This code example is part of a larger example provided for the PropertyTab class.

// Returns the properties of the specified component extended with
// a CategoryAttribute reflecting the name of the type of the property.
[ReflectionPermission(SecurityAction::Demand, Flags=ReflectionPermissionFlag::MemberAccess)]
virtual System::ComponentModel::PropertyDescriptorCollection^ GetProperties( Object^ component, array<System::Attribute^>^attributes ) override
{
   PropertyDescriptorCollection^ props;
   if ( attributes == nullptr )
            props = TypeDescriptor::GetProperties( component );
   else
            props = TypeDescriptor::GetProperties( component, attributes );

   array<PropertyDescriptor^>^propArray = gcnew array<PropertyDescriptor^>(props->Count);
   for ( int i = 0; i < props->Count; i++ )
   {
      // Create a new PropertyDescriptor from the old one, with
      // a CategoryAttribute matching the name of the type.
      array<Attribute^>^temp0 = {gcnew CategoryAttribute( props[ i ]->PropertyType->Name )};
      propArray[ i ] = TypeDescriptor::CreateProperty( props[ i ]->ComponentType, props[ i ], temp0 );

   }
   return gcnew PropertyDescriptorCollection( propArray );
}

virtual System::ComponentModel::PropertyDescriptorCollection^ GetProperties( Object^ component ) override
{
   return this->GetProperties( component, nullptr );
}

// Returns the properties of the specified component extended with 
// a CategoryAttribute reflecting the name of the type of the property.
public override System.ComponentModel.PropertyDescriptorCollection GetProperties(object component, System.Attribute[] attributes)
{
    PropertyDescriptorCollection props;
    if( attributes == null )
        props = TypeDescriptor.GetProperties(component);    
    else
        props = TypeDescriptor.GetProperties(component, attributes);    
    
    PropertyDescriptor[] propArray = new PropertyDescriptor[props.Count];            
    for(int i=0; i<props.Count; i++)           
    {                
        // Create a new PropertyDescriptor from the old one, with 
        // a CategoryAttribute matching the name of the type.
        propArray[i] = TypeDescriptor.CreateProperty(props[i].ComponentType, props[i], new CategoryAttribute(props[i].PropertyType.Name));
    }
    return new PropertyDescriptorCollection( propArray );
}

public override System.ComponentModel.PropertyDescriptorCollection GetProperties(object component)
{                     
    return this.GetProperties(component, null);
}

Remarks

The properties for the component parameter can differ from the properties of a class, because the site can add or remove properties if the component parameter is sited.

The attributes parameter array is used to filter the array. Filtering is defined by the following rules:

If a property does not have an Attribute of the same class, the property is not included in the returned array.
If the attribute is an instance of the Attribute class, the property must be an exact match or it is not included in the returned array.
If an Attribute instance is specified and it is the default property, it is included in the returned array even if there is no instance of the Attribute in the property.
If attributes has a default attribute, the GetProperties method matches the case when the property does not have the attribute applied.

If component is null, an empty collection is returned.

The order of the returned collection is not guaranteed to be identical between calls, so always order it before use.

Applies to

GetProperties(Object, Boolean)

Source:: TypeDescriptor.cs

Source:: TypeDescriptor.cs

Source:: TypeDescriptor.cs

Returns the collection of properties for a specified component using the default type descriptor.

public:
 static System::ComponentModel::PropertyDescriptorCollection ^ GetProperties(System::Object ^ component, bool noCustomTypeDesc);

public static System.ComponentModel.PropertyDescriptorCollection GetProperties (object component, bool noCustomTypeDesc);

static member GetProperties : obj * bool -> System.ComponentModel.PropertyDescriptorCollection

Public Shared Function GetProperties (component As Object, noCustomTypeDesc As Boolean) As PropertyDescriptorCollection

Parameters

component: Object

A component to get the properties for.

noCustomTypeDesc: Boolean

true to not consider custom type description information; otherwise, false.

Returns

PropertyDescriptorCollection

A PropertyDescriptorCollection with the properties for a specified component.

Exceptions

NotSupportedException

component is a cross-process remoted object.

Remarks

The properties for the component parameter can differ from the properties of a class, because the site can add or remove properties if the component parameter is sited.

If component is null, an empty collection is returned.

The order of the returned collection is not guaranteed to be identical between calls, so always order it before use.

Applies to

GetProperties(Type, Attribute[])

Source:: TypeDescriptor.cs

Source:: TypeDescriptor.cs

Source:: TypeDescriptor.cs

Returns the collection of properties for a specified type of component using a specified array of attributes as a filter.

public:
 static System::ComponentModel::PropertyDescriptorCollection ^ GetProperties(Type ^ componentType, cli::array <Attribute ^> ^ attributes);

public static System.ComponentModel.PropertyDescriptorCollection GetProperties (Type componentType, Attribute[] attributes);

public static System.ComponentModel.PropertyDescriptorCollection GetProperties (Type componentType, Attribute[]? attributes);

static member GetProperties : Type * Attribute[] -> System.ComponentModel.PropertyDescriptorCollection

Public Shared Function GetProperties (componentType As Type, attributes As Attribute()) As PropertyDescriptorCollection

Parameters

componentType: Type

The Type of the target component.

attributes: Attribute[]

An array of type Attribute to use as a filter.

Returns

PropertyDescriptorCollection

A PropertyDescriptorCollection with the properties that match the specified attributes for this type of component.

Examples

The following code example demonstrates how to implement the GetProperties method. This code example is part of a larger example provided for the PropertyTab class.

// Returns the properties of the specified component extended with
// a CategoryAttribute reflecting the name of the type of the property.
[ReflectionPermission(SecurityAction::Demand, Flags=ReflectionPermissionFlag::MemberAccess)]
virtual System::ComponentModel::PropertyDescriptorCollection^ GetProperties( Object^ component, array<System::Attribute^>^attributes ) override
{
   PropertyDescriptorCollection^ props;
   if ( attributes == nullptr )
            props = TypeDescriptor::GetProperties( component );
   else
            props = TypeDescriptor::GetProperties( component, attributes );

   array<PropertyDescriptor^>^propArray = gcnew array<PropertyDescriptor^>(props->Count);
   for ( int i = 0; i < props->Count; i++ )
   {
      // Create a new PropertyDescriptor from the old one, with
      // a CategoryAttribute matching the name of the type.
      array<Attribute^>^temp0 = {gcnew CategoryAttribute( props[ i ]->PropertyType->Name )};
      propArray[ i ] = TypeDescriptor::CreateProperty( props[ i ]->ComponentType, props[ i ], temp0 );

   }
   return gcnew PropertyDescriptorCollection( propArray );
}

virtual System::ComponentModel::PropertyDescriptorCollection^ GetProperties( Object^ component ) override
{
   return this->GetProperties( component, nullptr );
}

// Returns the properties of the specified component extended with 
// a CategoryAttribute reflecting the name of the type of the property.
public override System.ComponentModel.PropertyDescriptorCollection GetProperties(object component, System.Attribute[] attributes)
{
    PropertyDescriptorCollection props;
    if( attributes == null )
        props = TypeDescriptor.GetProperties(component);    
    else
        props = TypeDescriptor.GetProperties(component, attributes);    
    
    PropertyDescriptor[] propArray = new PropertyDescriptor[props.Count];            
    for(int i=0; i<props.Count; i++)           
    {                
        // Create a new PropertyDescriptor from the old one, with 
        // a CategoryAttribute matching the name of the type.
        propArray[i] = TypeDescriptor.CreateProperty(props[i].ComponentType, props[i], new CategoryAttribute(props[i].PropertyType.Name));
    }
    return new PropertyDescriptorCollection( propArray );
}

public override System.ComponentModel.PropertyDescriptorCollection GetProperties(object component)
{                     
    return this.GetProperties(component, null);
}

Remarks

Call this version of this method only when you do not have an instance of the object.

The attributes parameter array is used to filter the array. Filtering is defined by the following rules:

If a property does not have an Attribute of the same class, the property is not included in the returned array.
If the attribute is an instance of the Attribute class, the property must be an exact match or it is not included in the returned array.
If an Attribute instance is specified and it is the default property, it is included in the returned array even if there is no instance of the Attribute in the property.
If attributes has a default attribute, the GetProperties method matches the case when the property does not have the attribute applied.

If the componentType parameter is null, an empty collection is returned.

The order of the returned collection is not guaranteed to be identical between calls, so always order it before use.

Applies to

GetProperties(Object, Attribute[], Boolean)

Source:: TypeDescriptor.cs

Source:: TypeDescriptor.cs

Source:: TypeDescriptor.cs

Returns the collection of properties for a specified component using a specified array of attributes as a filter and using a custom type descriptor.

public:
 static System::ComponentModel::PropertyDescriptorCollection ^ GetProperties(System::Object ^ component, cli::array <Attribute ^> ^ attributes, bool noCustomTypeDesc);

public static System.ComponentModel.PropertyDescriptorCollection GetProperties (object component, Attribute[] attributes, bool noCustomTypeDesc);

public static System.ComponentModel.PropertyDescriptorCollection GetProperties (object component, Attribute[]? attributes, bool noCustomTypeDesc);

static member GetProperties : obj * Attribute[] * bool -> System.ComponentModel.PropertyDescriptorCollection

Public Shared Function GetProperties (component As Object, attributes As Attribute(), noCustomTypeDesc As Boolean) As PropertyDescriptorCollection

Parameters

component: Object

A component to get the properties for.

attributes: Attribute[]

An array of type Attribute to use as a filter.

noCustomTypeDesc: Boolean

true to not consider custom type description information; otherwise, false.

Returns

PropertyDescriptorCollection

A PropertyDescriptorCollection with the events that match the specified attributes for the specified component.

Exceptions

NotSupportedException

component is a cross-process remoted object.

Remarks

The properties for a component can differ from the properties of a class, because the site can add or remove properties if the component is sited.

The attributes parameter array is used to filter the array. Filtering is defined by the following rules:

If a property does not have an Attribute of the same class, the property is not included in the returned array.
If the attribute is an instance of the Attribute class, the property must be an exact match or it is not included in the returned array.
If an Attribute instance is specified and it is the default property, it is included in the returned array even if there is no instance of the Attribute in the property.
If attributes has a default attribute, the GetProperties method matches the case when the property does not have the attribute applied.

If the component parameter is null, an empty collection is returned.

The order of the returned collection is not guaranteed to be identical between calls, so always order it before use.

Applies to

Споделяне чрез

TypeDescriptor.GetProperties Method

Definition

Overloads

GetProperties(Object)

Parameters

Returns

Exceptions

Examples

Remarks

See also

Applies to

GetProperties(Type)

Parameters

Returns

Remarks

See also

Applies to

GetProperties(Object, Attribute[])

Parameters

Returns

Exceptions

Examples

Remarks

See also

Applies to

GetProperties(Object, Boolean)

Parameters

Returns

Exceptions

Remarks

See also

Applies to

GetProperties(Type, Attribute[])

Parameters

Returns

Examples

Remarks

See also

Applies to

GetProperties(Object, Attribute[], Boolean)

Parameters

Returns

Exceptions

Remarks

See also

Applies to

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