Expression.Throw Method (Expression)

// Add the following directive to the file: 
// using System.Linq.Expressions;   

// A TryExpression object that has a Catch statement. 
// The return types of the Try block and all Catch blocks must be the same.
TryExpression tryCatchExpr =
    Expression.TryCatch(
        Expression.Block(
            Expression.Throw(Expression.Constant(new DivideByZeroException())),
            Expression.Constant("Try block")
        ),
        Expression.Catch(
            typeof(DivideByZeroException),
            Expression.Constant("Catch block")
        )
    );

// The following statement first creates an expression tree, 
// then compiles it, and then runs it. 
// If the exception is caught,  
// the result of the TryExpression is the last statement  
// of the corresponding Catch statement.
Console.WriteLine(Expression.Lambda<Func<string>>(tryCatchExpr).Compile()());

// This code example produces the following output: 
// 
// Catch block