铸造整数数组来枚举数组 [英] Casting an array of integers to an array of enums

问题描述

我有一个枚举，有4个值：

I have an enum that has 4 values:

public enum DriveRates 
{ 
    driveSidereal = 0,
    driveLunar = 1, 
    driveSolar = 2, 
    driveKing = 3 
} 

我有，我想转换为DriveRa​​tes数组值的数组。然而，当我这样做 VAR率=（DriveRa​​tes []）RET; ，与 RET 是数字的对象数组（可能是整数），它说无法转换类型的对象System.Object的[]'输入'ASCOM.DeviceInterface.DriveRa​​tes []'。

I have an array of values that I want to cast to an array of DriveRates. However when I do var rates = (DriveRates[])ret;, with ret being an object array of numbers (probably integers), it says Unable to cast object of type 'System.Object[]' to type 'ASCOM.DeviceInterface.DriveRates[]'.

RET = {0,1,2,3} 。我应该怎么做这个代替。同样，我试图枚举值的数组转换为枚举的数组......嗯，价值观:)不过我想从类型转换 [对象] 键入 DriveRa​​tes [] 。

ret={0,1,2,3}. How should I do this instead. Again, I am trying to convert an array of enum values to an array of enum...well, values :) But I'm trying to convert from type object[] to type DriveRates[].

推荐答案

您不能只是投阵列，如果它是一个真正的 [对象] 。您的可以的创建一个新的阵列pretty的很容易，但：

You can't just cast the array, if it's really an object[]. You can create a new array pretty easily though:

var enumArray = originalArray.Cast<DriveRates>().ToArray();

如果它是的实际上的的 INT [] 阵列，开始时，你可以投 - 尽管你必须很好地交谈C＃编译器首先：

If it were actually an int[] array to start with, you could cast - although you'd have to talk nicely to the C# compiler first:

using System;

class Program
{
    enum Foo
    {
        Bar = 1,
        Baz = 2
    }

    static void Main()
    {
        int[] ints = new int[] { 1, 2 };
        Foo[] foos = (Foo[]) (object) ints;
        foreach (var foo in foos)
        {
            Console.WriteLine(foo);
        }
    }
}

C＃编译器并不认为有从一个转换 INT []到富[] （和没有，C＃的规则）之内......但CLR是罚款与此转换，所以只要你能说服C＃编译器一起玩（通过转换成对象第一）还行吧。

The C# compiler doesn't believe that there's a conversion from int[] to Foo[] (and there isn't, within the rules of C#)... but the CLR is fine with this conversion, so as long as you can persuade the C# compiler to play along (by casting to object first) it's fine.

本的不的工作时，原来的数组是一个真正的 [对象] 虽然。

This doesn't work when the original array is really an object[] though.

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