.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"}
    ...
}

你不能创建一个“const”数组，因为数组是对象，只能是对象 在运行时创建，const实体在编译时解析。

你可以将数组声明为“readonly”。这是 与const的效果相同，只是该值可以在运行时设置。它只能是 设置一次，之后它就是一个只读(即const)值。

这是一种做你想做的事情的方法:

using System;
using System.Collections.ObjectModel;
using System.Collections.Generic;

public ReadOnlyCollection<string> Titles { get { return new List<string> { "German", "Spanish", "Corrects", "Wrongs" }.AsReadOnly();}}

它非常类似于做一个只读数组。

我相信你只能让它只读。

可以将数组声明为只读数组，但请记住，可以更改只读数组的元素。

public readonly string[] Titles = { "German", "Spanish", "Corrects", "Wrongs" };
...
Titles[0] = "bla";

可以考虑像Cody建议的那样使用enum或IList。

public readonly IList<string> ITitles = new List<string> {"German", "Spanish", "Corrects", "Wrongs" }.AsReadOnly();