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Expression.Call Method (MethodInfo, Expression, Expression)

Creates a MethodCallExpression that represents a call to an static method that takes two arguments.

Namespace:  System.Linq.Expressions
Assembly:  System.Core (in System.Core.dll)

public static MethodCallExpression Call(
	MethodInfo method,
	Expression arg0,
	Expression arg1
)

Parameters

method
Type: System.Reflection.MethodInfo
A MethodInfo to set the Method property equal to.
arg0
Type: System.Linq.Expressions.Expression
The Expression that represents the first argument.
arg1
Type: System.Linq.Expressions.Expression
The Expression that represents the second argument.

Return Value

Type: System.Linq.Expressions.MethodCallExpression
A MethodCallExpression that has the NodeType property equal to Call and the Object and Method properties set to the specified values.

ExceptionCondition
ArgumentNullException

method is null.

The following code example shows how to create an expression that calls an instance method that has two arguments.


// Add the following directive to your file:
// using System.Linq.Expressions;  
public class SampleClass
{
   public int AddIntegers(int arg1, int arg2)
   {
      return arg1 + arg2;
   }
}

static public void TestCall(System.Windows.Controls.TextBlock outputBlock)
{
   // This expression represents a call to an instance method that has two arguments.
   // The first argument is an expression that creates a new object of the specified type.
   Expression callExpr = Expression.Call(
       Expression.New(typeof(SampleClass)),
       typeof(SampleClass).GetMethod("AddIntegers", new Type[] { typeof(int), typeof(int) }),
       Expression.Constant(1),
       Expression.Constant(2)
       );

   // Print out the expression.
   outputBlock.Text += callExpr.ToString() + "\n";

   // The following statement first creates an expression tree,
   // then compiles it, and then executes it.
   outputBlock.Text += Expression.Lambda<Func<int>>(callExpr).Compile()() + "\n";

   // This code example produces the following output:
   //
   // new SampleClass().AddIntegers(1, 2)
   // 3
}


Silverlight

Supported in: 5, 4

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.

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