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
}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
}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()());输出：
"sample string".ToUpper SAMPLE STRING