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PONested Lambda for use with Fluent Interface
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  1. PONested Lambda for use with Fluent Interface
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    copied!<p><strong>Given the following types:</strong></p> <pre><code>class Parent { List&lt;Child&gt; Children {get;set;}} class Child {List&lt;Child&gt; GrandChildren {get;set;}} class Helper&lt;TEntity&gt; {List&lt;string&gt; Properties {get;set;}} </code></pre> <p><strong>And given the following methods on Helper...</strong></p> <pre><code>public Helper AddProps&lt;TEntity, TProp&gt;(Expression&lt;Func&lt;TEntity, TProp&gt;&gt; exp) { this.Properties.Add(GetPropInfo(exp).Name); } public PropertyInfo GetPropInfo(Expression&lt;Func&lt;TEntity, TProp&gt;&gt; exp) { return (PropertyInfo)((MemberExpression)(expression.Body)).Member; } </code></pre> <p><strong>I am able to do this:</strong></p> <pre><code>Helper&lt;Parent&gt; myHelper = new Helper&lt;Parent&gt;(); myHelper.AddProps(x =&gt; x.Children); </code></pre> <p>The string list "Properties" on myHelper would then contain the value "Children", the name of the property passed through the expression.</p> <p>What I want to do now is to be able to achieve the same thing, only with the ability to reflect type hierarchy.</p> <p><strong>Would it look like this ?</strong></p> <pre><code>x =&gt; x.Children { xx =&gt; xx.GrandChildren } </code></pre> <p>Or is it even possible, and what would be involved? I've seen nested lambda's before but don't know what's involved.</p> <p>Thanks in advance!</p> <p><strong>EDIT</strong></p> <p>It seems there is some confusion so I'll try to clarify. I want to be able to create a string that looks like this "Object.SubObject.SubSubObject" using lambda expressions and method chaining. My example does this, but only for one level deep ( a property of a class). What I want to do is extend this to go to any depth.</p> <p>For Example, I'd like to use lambda expressions with a fluent interface that would look something like this....</p> <p>AddProps(x => x.Children).AddProps(xx => xx.GrandChildren) and that would add "Children.GrandChildren" to my "Properties" string list.</p>
 

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