You can build an expression tree which contains a goto statement using Expression.Goto method. For example, you have the following code.
Console.WriteLine("First Statement");
goto JumpTo;
Console.WriteLine("Second Statement");
JumpTo:
Console.WriteLine("Third Statement and Second Statement is skiped");
Here is the code that is required to build the same functionality using expression tree.
// A label expression of the void type that is the target for the GotoExpression.
LabelTarget JumpTo = Expression.Label();
// This block contains a GotoExpression.
// It transfers execution to a label expression that is initialized with the same LabelTarget as the GotoExpression.
// The types of the GotoExpression, label expression, and LabelTarget must match.
BlockExpression blockExpr = Expression.Block(
WriteLineExpression("First Statment"),
Expression.Goto(JumpTo),
WriteLineExpression("Second Statment"),
Expression.Label(JumpTo),
WriteLineExpression("Third Statment and Second Statment is skiped")
);
Expression.Lambda<Action>(blockExpr).Compile()();
This example shows how to create an expression that contains a goto statement. Here is the code for WriteLineExpression method
public static Expression WriteLineExpression(string s)
{
return Expression.Call(null,
typeof(Console).GetMethod("WriteLine", new Type[] { typeof(String) }),
Expression.Constant(s));
}