System.Array中的聚合和ToArray函数不起作用 [英] Aggregate and ToArray function in System.Array not working

问题描述

我有两个错误:

"System.Array"不包含"Aggregate"的定义，并且没有扩展方法'Aggregate'接受类型的第一个参数可以找到"System.Array"(您是否缺少using指令或程序集参考?)

'System.Array' does not contain a definition for 'Aggregate' and no extension method 'Aggregate' accepting a first argument of type 'System.Array' could be found (are you missing a using directive or an assembly reference?)

'System.Collections.Generic.IEnumerable< object []>'不包含"ToArray"的定义，没有扩展方法"ToArray"接受类型的第一个参数可以找到"System.Collections.Generic.IEnumerable<对象[]>"(您是否缺少using指令或程序集引用?)

'System.Collections.Generic.IEnumerable<object[]>' does not contain a definition for 'ToArray' and no extension method 'ToArray' accepting a first argument of type 'System.Collections.Generic.IEnumerable<object[]>' could be found (are you missing a using directive or an assembly reference?)

这是我的代码:

    /*
     * Get all the possible permutations
     */
    public static IEnumerable<object[]> CartesianProduct(params object[][] inputs)
    {
        //ERROR: Function Aggregate is not recognized
        return inputs.Aggregate(
            (IEnumerable<object[]>)new object[][] { new object[0] },
            (soFar, input) =>
                from prevProductItem in soFar
                from item in input
                select prevProductItem.Concat(new object[] { item }).ToArray());
    }

    public void test()
    {
            //Get all the posible permutations between parents values.
            var cartesianProduct = CartesianProduct(parentsValues);
            object[][] producto = cartesianProduct.ToArray();
            //ERROR: Function ToArray is not recognized
    }

推荐答案

您丢失了

using System.Linq;

位于文件顶部.没有这个，C#编译器将不知道在哪里找到您要使用的LINQ扩展.

at the top of your file. Without this, the C# compiler doesn't know where the find the LINQ extensions you're trying to use.

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