How do I Create an Expression Tree by Parsing Xml in C#?
-
19-08-2019 - |
Question
I am looking to create an expression tree by parsing xml using C#. The xml would be like the following:
<Expression>
<If>
<Condition>
<GreaterThan>
<X>
<Y>
</GreaterThan>
</Condition>
<Expression />
<If>
<Else>
<Expression />
</Else>
<Expression>
or another example...
<Expression>
<Add>
<X>
<Expression>
<Y>
<Z>
</Expression>
</Add>
</Expression>
...any pointers on where to start would be helpful.
Kind regards,
Solution
using System.Linq.Expressions; //in System.Core.dll
Expression BuildExpr(XmlNode xmlNode)
{ switch(xmlNode.Name)
{ case "Add":
{ return Expression.Add( BuildExpr(xmlNode.ChildNodes[0])
,BuildExpr(xmlNode.ChilNodes[1]));
}
/* ... */
}
}
OTHER TIPS
I'd start by looking at the DLR, which has a published expression tree mechanism.
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