This documentation is archived and is not being maintained.

SoapHeader::MustUnderstand Property

Gets or sets a value indicating whether the SoapHeader must be understood.

Namespace:  System.Web.Services.Protocols
Assembly:  System.Web.Services (in System.Web.Services.dll)

public:
property bool MustUnderstand {
	bool get ();
	void set (bool value);
}

Property Value

Type: System::Boolean
true if the XML Web service must properly interpret and process the SoapHeader; otherwise, false. The default is false.

When an XML Web service client adds a SOAP header to an XML Web service method call with the MustUnderstand property set to true, the XML Web service method must set the DidUnderstand property to true; otherwise, a SoapHeaderException is thrown back to the XML Web service client by ASP.NET.

Although both the EncodedMustUnderstand and MustUnderstand properties can be used to set the value of the mustUnderstand attribute within the SOAP header, the MustUnderstand property allows you to set the attribute using a Boolean value.

For details on adding SOAP headers to clients, see [<topic://cpconusingsoapheaders>].

The following XML Web service client defines a custom SOAP header of type MyHeader, sets the MustUnderstand property to true, and invokes the MyWebMethod XML Web service method. If the XML Web service method does not set the DidUnderstand property of the MyHeader SOAP header to true, a SoapHeaderException is thrown.

int main()
{
   MyWebService^ ws = gcnew MyWebService;
   try
   {
      MyHeader^ customHeader = gcnew MyHeader;
      customHeader->MyValue = "Header Value for MyValue";
      customHeader->MustUnderstand = true;
      ws->myHeader = customHeader;
      int results = ws->MyWebMethod( 3, 5 );
   }
   catch ( Exception^ e ) 
   {
      Console::WriteLine( "Exception: {0}", e );
   }

}
int main() {
   MyWebService* ws = new MyWebService();

   try {
      MyHeader* customHeader = new MyHeader();
      customHeader->MyValue = S"Header Value for MyValue";
      customHeader->MustUnderstand = true;
      ws->myHeader = customHeader;

      int results = ws->MyWebMethod(3,5);
   }
   catch (Exception* e) {
      Console::WriteLine (S"Exception: {0}", e);
   }
}

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 3.5, 2.0, 1.0
Show: