CustomAttribute Class

Specifies a custom attribute for a class or a class member.

Namespace: DevExpress.Xpo

Assembly: DevExpress.Xpo.v21.1.dll

NuGet Package: DevExpress.Xpo

Declaration

C#

[AttributeUsage(AttributeTargets.Class | AttributeTargets.Property | AttributeTargets.Field | AttributeTargets.Interface, Inherited = true, AllowMultiple = true)]
public sealed class CustomAttribute :
    Attribute

VB.NET

<AttributeUsage(AttributeTargets.Class Or AttributeTargets.Property Or AttributeTargets.Field Or AttributeTargets.Interface, Inherited:=True, AllowMultiple:=True)>
Public NotInheritable Class CustomAttribute
    Inherits Attribute

Remarks

The CustomAttribute class allows you to provide custom parameters for a class or a class member. The attribute’s name is specified by the CustomAttribute.Name property. Its value is specified by the CustomAttribute.Value property.

Example

This sample demonstrates how to load metadata from a string in XML format.

C#

public bool IsDisplayNameAttributeSpecified(string className) {
    string xmlMetaData =
    "<Model xmlns=\"http://www.devexpress.com/products/xpo/schemas/1.9/xpometadata.xsd\">" +
    "<Class assembly=\"" + "WindowsApplication" + "\" type=\"" + className + "\">" +
    "    <Attributes>" +
    "       <CustomAttribute Name=\"DisplayName\" Value=\"Test person\"/>" +
    "       <CustomAttribute Name=\"ReadOnly\" Value=\"true\"/>" +
    "    </Attributes>" +
    "</Class>" +
    "</Model>";
    ReflectionDictionary dict = new ReflectionDictionary();
    dict.LoadXmlMetadata(new System.IO.StringReader(xmlMetaData));
    XPClassInfo ci = dict.GetClassInfo("WindowsApplication", className);
    if (ci.HasAttribute("DisplayName"))
        return true;
    return false;
}

VB.NET

Public Function IsDisplayNameAttributeSpecified(ByVal className As String) As Boolean
    Dim xmlMetaData As String = _
    "<Model xmlns=""http://www.devexpress.com/products/xpo/schemas/1.9/xpometadata.xsd"">" & _
        "<Class assembly=""WindowsApplication"" type=""" & className & """>" & _
            "<Attributes>" & _
                "<CustomAttribute Name=""DisplayName"" Value=""Test person""/>" & _
                "<CustomAttribute Name=""ReadOnly"" Value=""true""/>" & _
            "</Attributes>" & _
        "</Class>" & _
    "</Model>"
    Dim dict As New ReflectionDictionary()
    dict.LoadXmlMetadata(New System.IO.StringReader(xmlMetaData))
    Dim ci As XPClassInfo = dict.GetClassInfo("WindowsApplication", className)
    If ci.HasAttribute("DisplayName") Then
        Return True
    End If
    Return False
End Function

Inheritance

Object

Attribute

CustomAttribute