ILGenerator.MarkLabel Method
Silverlight
Marks the Microsoft intermediate language (MSIL) stream's current position with the given label.
Namespace: System.Reflection.Emit
Assembly: mscorlib (in mscorlib.dll)
Parameters
- loc
- Type: System.Reflection.Emit.Label
The label for which to set an index.
| Exception | Condition |
|---|---|
| ArgumentException | loc represents an invalid index into the label array. -or- An index for loc has already been defined. |
The following example demonstrates the use of MarkLabel to establish the location of a label that was defined earlier. Notice that the label is used in a call to the Emit(OpCode, Label) method overload before its location has been established.
This code is part of a larger example provided for the BeginExceptionBlock method.
adderIL.BeginFinallyBlock(); // The finally block block displays a message on the TextBlock, if the // OutputBlock field has been set. Just as in the catch block, the following // code tests whether the TextBlock is present, and skips the output if it is // not present. adderIL.Emit(OpCodes.Ldsfld, demoOutput); adderIL.Emit(OpCodes.Ldnull); adderIL.Emit(OpCodes.Ceq); adderIL.Emit(OpCodes.Brtrue_S, skipOutputInFinally); // Append a constant string to the Text property of the TextBlock. adderIL.Emit(OpCodes.Ldsfld, demoOutput); adderIL.Emit(OpCodes.Ldsfld, demoOutput); adderIL.Emit(OpCodes.Callvirt, getter); adderIL.Emit(OpCodes.Ldstr, "Executing the finally block.\n"); adderIL.Emit(OpCodes.Call, concat2); adderIL.Emit(OpCodes.Callvirt, setter); adderIL.MarkLabel(skipOutputInFinally); // This is the end of the try/catch/finally block. adderIL.EndExceptionBlock();
For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.
