本文整理汇总了C#中System.Linq.Expressions.IndexExpression类的典型用法代码示例。如果您正苦于以下问题：C# IndexExpression类的具体用法？C# IndexExpression怎么用？C# IndexExpression使用的例子？那么恭喜您, 这里精选的类代码示例或许可以为您提供帮助。
IndexExpression类属于System.Linq.Expressions命名空间，在下文中一共展示了IndexExpression类的1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:
// Add the following directive to your file:
// using System.Linq.Expressions;
// This parameter expression represents a variable that will hold the array.
ParameterExpression arrayExpr = Expression.Parameter(typeof(int[]), "Array");
// This parameter expression represents an array index.
ParameterExpression indexExpr = Expression.Parameter(typeof(int), "Index");
// This parameter represents the value that will be added to a corresponding array element.
ParameterExpression valueExpr = Expression.Parameter(typeof(int), "Value");
// This expression represents an array access operation.
// It can be used for assigning to, or reading from, an array element.
Expression arrayAccessExpr = Expression.ArrayAccess(
arrayExpr,
indexExpr
);
// This lambda expression assigns a value provided to it to a specified array element.
// The array, the index of the array element, and the value to be added to the element
// are parameters of the lambda expression.
Expression<Func<int[], int, int, int>> lambdaExpr = Expression.Lambda<Func<int[], int, int, int>>(
Expression.Assign(arrayAccessExpr, Expression.Add(arrayAccessExpr, valueExpr)),
arrayExpr,
indexExpr,
valueExpr
);
// Print out expressions.
Console.WriteLine("Array Access Expression:");
Console.WriteLine(arrayAccessExpr.ToString());
Console.WriteLine("Lambda Expression:");
Console.WriteLine(lambdaExpr.ToString());
Console.WriteLine("The result of executing the lambda expression:");
// The following statement first creates an expression tree,
// then compiles it, and then executes it.
// Parameters passed to the Invoke method are passed to the lambda expression.
Console.WriteLine(lambdaExpr.Compile().Invoke(new int[] { 10, 20, 30 }, 0, 5));输出：
Array Access Expression: Array[Index] Lambda Expression: (Array, Index, Value) => (Array[Index] = (Array[Index] + Value)) The result of executing the lambda expression: 15