从c# 6开始，你可以这样写:

public static string[] Titles => new string[] { "German", "Spanish", "Corrects", "Wrongs" };

参见:c#:新的和改进的c# 6.0(特别是“表达式体函数和属性”一章)

这将使一个只读的静态属性，但它仍然允许您更改返回的数组的内容，但当您再次调用该属性时，您将再次获得原始的、未更改的数组。

为了澄清，这段代码与(或实际上是缩写)相同:

public static string[] Titles
{
    get { return new string[] { "German", "Spanish", "Corrects", "Wrongs" }; }
}

请注意，这种方法有一个缺点:每个引用实际上都会实例化一个新数组，因此如果您使用的是一个非常大的数组，这可能不是最有效的解决方案。 但是如果你重复使用相同的数组(例如把它放在一个私有属性中)，它将再次打开改变数组内容的可能性。

如果你想要一个不可变数组(或列表)，你也可以使用:

public static IReadOnlyList<string> Titles { get; } = new string[] { "German", "Spanish", "Corrects", "Wrongs" };

但是，这仍然有更改的风险，因为你仍然可以将其转换回字符串[]并更改内容，如下所示:

((string[]) Titles)[1] = "French";

作为一种替代方法，要解决使用只读数组可以修改元素的问题，可以使用静态属性。(单个元素仍然可以更改，但这些更改只会在数组的本地副本上进行。)

public static string[] Titles 
{
    get
    {
        return new string[] { "German", "Spanish", "Corrects", "Wrongs"};
    }
}

当然，这不是特别有效，因为每次都会创建一个新的字符串数组。

我相信你只能让它只读。

数组可能是一种只能在这里求值的东西 运行时。常量必须在编译时求值。尝试使用"readonly" 而不是"const"。

.NET Framework v4.5+解决方案，改进了tdbeckett的答案:

using System.Collections.ObjectModel;

// ...

public ReadOnlyCollection<string> Titles { get; } = new ReadOnlyCollection<string>(
  new string[] { "German", "Spanish", "Corrects", "Wrongs" }
);

注意:假定集合在概念上是常量，在类级别声明它时将其设置为静态可能是有意义的。

上面的:

Initializes the property's implicit backing field once with the array. Note that { get; } - i.e., declaring only a property getter - is what makes the property itself implicitly read-only (trying to combine readonly with { get; } is actually a syntax error). Alternatively, you could just omit the { get; } and add readonly to create a field instead of a property, as in the question, but exposing public data members as properties rather than fields is a good habit to form. Creates an array-like structure (allowing indexed access) that is truly and robustly read-only (conceptually constant, once created), both with respect to: preventing modification of the collection as a whole (such as by removing or adding elements, or by assigning a new collection to the variable). preventing modification of individual elements. (Even indirect modification isn't possible - unlike with an IReadOnlyList<T> solution, where a (string[]) cast can be used to gain write access to the elements, as shown in mjepsen's helpful answer. The same vulnerability applies to the IReadOnlyCollection<T> interface, which, despite the similarity in name to class ReadOnlyCollection, does not even support indexed access, making it fundamentally unsuitable for providing array-like access.)

快速的解决方法，说不定对别人有帮助。我需要一个字符串[]作为Attribute的参数(在某些理论中为测试用例传递内联数据)。Readonly在这里没用。但是，我最后做的是:

const string foo = "a|b|c";

[InlineData(foo)]
public void Test(string fooString)
{
    var foo = fooString.Split("|"); // foo == {"a","b","c"}
    ...
}