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Message from discussion Passing expression trees into Moq
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Daniel Cazzulino  
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 More options Sep 22 2011, 10:46 am
From: Daniel Cazzulino <dan...@cazzulino.com>
Date: Thu, 22 Sep 2011 11:46:28 -0300
Local: Thurs, Sep 22 2011 10:46 am
Subject: Re: [Moq] Passing expression trees into Moq

Expression.Return(Expression.Label(),

that's wrong. you're not returning a label.

best way to go about this is to create the expression lambda with C# (v =>
v.Bar) and inspect the resulting expression tree. That's what you should be
creating next with expression API. There won't be a label there for sure.

/kzu

--
Daniel Cazzulino | Developer Lead | XML MVP | Clarius Consulting | +1
425.329.3471

On Thu, Sep 22, 2011 at 05:59, benny <ceddlybu...@googlemail.com> wrote:
> Is it possible to write code like the following. I'm trying to using
> Moq with objects that I'm reflecting on as part of a testing
> framework. The code below raises a "Unhandled expression type: 'Goto'"
> exception from Moq, which I guess is expecting something different. It
> kind of looks like it should work though!

> private void button1_Click(object sender, EventArgs e)
> {
>        Ifoo  = foo Foo();

>        // Create input parameter for lambda
>        ParameterExpression value = Expression.Parameter(typeof(IFoo),
> "value");

>        // create return statement for lambda
>        Expression setupProperty =
> Expression.Return(Expression.Label(), Expression.Property(value,
> "Bar"), typeof(string));

>        // convert expression to lambda (should now be the equivalent
> of "v => v.Bar")
>        var func = Expression.Lambda<Func<IFoo,
> string>>(setupProperty, value);//.Compile();
>        //string s = func(foo); // this bit works fine in .Compile()
> is included

>        var mockFoo = new Mock<IFoo>();

>        mockFoo.SetupProperty(func); // exception thrown by moq here,
> obviously isn't exactly the same as "v => v.Bar"
>        mockFoo.Object.Bar = "Burge+";
> }

> --
> Post: moqdisc@googlegroups.com
> Unsubscribe: moqdisc-unsubscribe@googlegroups.com


 
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