Expression.Parameter Method (Type)
.NET Framework (current version)
Creates a ParameterExpression node that can be used to identify a parameter or a variable in an expression tree.
Assembly: System.Core (in System.Core.dll)
Parameters
- type
-
Type:
System.Type
The type of the parameter or variable.
Return Value
Type: System.Linq.Expressions.ParameterExpressionA ParameterExpression node with the specified name and type.
The following example demonstrates how to create a MethodCallExpression object that prints the value of a ParameterExpression object.
// Add the following directive to the file: // using System.Linq.Expressions; // Creating a parameter for the expression tree. ParameterExpression param = Expression.Parameter(typeof(int)); // Creating an expression for the method call and specifying its parameter. MethodCallExpression methodCall = Expression.Call( typeof(Console).GetMethod("WriteLine", new Type[] { typeof(int) }), param ); // The following statement first creates an expression tree, // then compiles it, and then runs it. Expression.Lambda<Action<int>>( methodCall, new ParameterExpression[] { param } ).Compile()(10); // This code example produces the following output: // // 10
Universal Windows Platform
Available since 8
.NET Framework
Available since 4.0
Portable Class Library
Supported in: portable .NET platforms
Silverlight
Available since 4.0
Windows Phone Silverlight
Available since 8.0
Windows Phone
Available since 8.1
Available since 8
.NET Framework
Available since 4.0
Portable Class Library
Supported in: portable .NET platforms
Silverlight
Available since 4.0
Windows Phone Silverlight
Available since 8.0
Windows Phone
Available since 8.1
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