更改线程区域性 .NET Framework 4.6 及更高版本

Question

我正在尝试更改一个新线程 CultureInfo，如下例所示，但是：

尝试 1：SetCulture1() 没有改变我的话题

尝试 2：SetCulture2() 我遇到异常 "System.InvalidOperationException: instance is read-only"（当设置 CurrencyDecimalSeparator 时）

static void Main(string[] args)
{
    Thread th = new Thread(thread_test);

    // nothing happens
    SetCulture1(th);

    // exception System.InvalidOperationException: instance is read-only
    SetCulture2(th);

    th.Start();
}

public static void SetCulture1(System.Threading.Thread thread)
{
    var ci = new System.Globalization.CultureInfo("pt-BR");
    ci.NumberFormat.CurrencyDecimalSeparator = ".";

    thread.CurrentCulture = ci; // <-- after this culture info not change

    if (thread.CurrentCulture.NumberFormat.CurrencyDecimalSeparator != ".")
    {
        Console.WriteLine("Nothing happened");
        Console.ReadKey();
    }
}

public static void SetCulture2(System.Threading.Thread thread)
{
    thread.CurrentCulture = new System.Globalization.CultureInfo("pt-BR");
    thread.CurrentCulture.NumberFormat.CurrencyDecimalSeparator = "."; // <-- exception throws here
}

static void thread_test()
{
    Console.WriteLine("Culture: {0}", CultureInfo.CurrentCulture.DisplayName);
}

我注意到在 .net 4.6 之前此示例有效。 4.6 有什么变化吗？

谢谢！

Answer 1

虽然这种奇怪的情况没有答案 (Microsoft bug report)，但我找到了在代码开头设置 DefaultThreadCurrentCulture 的解决方法（主要方法）：

        var ci = new System.Globalization.CultureInfo(System.Globalization.CultureInfo.CurrentCulture.LCID);
        ci.NumberFormat.CurrencyDecimalSeparator = ".";
        ci.NumberFormat.CurrencyGroupSeparator = ",";
        ci.NumberFormat.NumberDecimalSeparator = ".";
        ci.NumberFormat.NumberGroupSeparator = ",";
        ci.NumberFormat.PercentDecimalSeparator = ".";
        ci.NumberFormat.PercentGroupSeparator = ",";
        System.Globalization.CultureInfo.DefaultThreadCurrentCulture = ci;
        System.Globalization.CultureInfo.DefaultThreadCurrentUICulture = ci;

更改线程区域性 .NET Framework 4.6 及更高版本

Change thread culture .NET Framework 4.6 and later versions

.net

c#

multithreading

cultureinfo