C# Expression.Call方法代码示例

本文整理汇总了C#中System.Linq.Expressions.Expression.Call方法的典型用法代码示例。如果您正苦于以下问题：C# Expression.Call方法的具体用法？C# Expression.Call怎么用？C# Expression.Call使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类System.Linq.Expressions.Expression的用法示例。

在下文中一共展示了Expression.Call方法的3个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于我们的系统推荐出更棒的C#代码示例。

示例1: AddIntegers

 

// 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()
{
    // 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.
    Console.WriteLine(callExpr.ToString());

    // The following statement first creates an expression tree,
    // then compiles it, and then executes it.
    Console.WriteLine(Expression.Lambda<Func<int>>(callExpr).Compile()());

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

开发者ID:.NET开发者，项目名称:System.Linq.Expressions，代码行数:33，代码来源:Expression.Call

示例2: Increment

 

// Add the following directive to your file:
// using System.Linq.Expressions;  

public class SampleClass
{
    public static int Increment(int arg1)
    {
        return arg1 + 1;
    }
}

static public void TestCall()
{

    //This expression represents a call to an instance method with one argument.
    Expression callExpr = Expression.Call(
                            typeof(SampleClass).GetMethod("Increment"),
                            Expression.Constant(2)
                        );

    // Print out the expression.
    Console.WriteLine(callExpr.ToString());

    // The following statement first creates an expression tree,
    // then compiles it, and then executes it.
    Console.WriteLine(Expression.Lambda<Func<int>>(callExpr).Compile()());

    // This code example produces the following output:
    //
    // Increment(2)
    // 3
}

开发者ID:.NET开发者，项目名称:System.Linq.Expressions，代码行数:32，代码来源:Expression.Call

示例3: typeof

 

// Add the following directive to your file:
// using System.Linq.Expressions;  

// This expression represents a call to an instance method without arguments.
Expression callExpr = Expression.Call(
    Expression.Constant("sample string"), typeof(String).GetMethod("ToUpper", new Type[] { }));

// Print out the expression.
Console.WriteLine(callExpr.ToString());

// The following statement first creates an expression tree,
// then compiles it, and then executes it.  
Console.WriteLine(Expression.Lambda<Func<String>>(callExpr).Compile()());

开发者ID:.NET开发者，项目名称:System.Linq.Expressions，代码行数:13，代码来源:Expression.Call

输出：

"sample string".ToUpper
SAMPLE STRING

注：本文中的System.Linq.Expressions.Expression.Call方法示例整理自Github/MSDocs等源码及文档管理平台，相关代码片段筛选自各路编程大神贡献的开源项目，源码版权归原作者所有，传播和使用请参考对应项目的License；未经允许，请勿转载。

 

出处：https://vimsky.com/examples/detail/csharp-method-system.linq.expressions.expression.call.html