实例是只读异常，而在asp.net中更改区域性 [英] Instance is read-only Exception while changing culture in asp.net

问题描述

我尝试在用户能够更改语言，日期格式等的地方实现多文化应用程序.我编写了core，但是它返回Exception: System.InvalidOperationException:实例为只读.

I try to implement multicultural application where users able to change language, date format and etc. I wrote core but it returns Exception: System.InvalidOperationException: Instance is read-only.

switch (culture)
    {
        case SystemCulture.English:
                Thread.CurrentThread.CurrentCulture = new CultureInfo(CultureCodes.English);
                Thread.CurrentThread.CurrentUICulture = new CultureInfo(CultureCodes.English);
                break;
                        //another cultures here
    }
    switch (cultureFormat)
    {
        case SystemDateFormat.European:
                  var europeanDateFormat = CultureInfo.GetCultureInfo(CultureCodes.Italian).DateTimeFormat;
                  Thread.CurrentThread.CurrentCulture.DateTimeFormat = europeanDateFormat;
                  Thread.CurrentThread.CurrentUICulture.DateTimeFormat = europeanDateFormat;
                  break;
    //another cultures here
    }
        

我在互联网上找到了一些信息，我必须使用我所在文化的新实例对象，我更改了代码，只是添加了以下内容:

I found some information on internet and i have to use new instance object of my culture, i changed my code just adding:

CultureInfo myCulture;

switch (culture)
{
       case SystemCulture.English:
            myCulture= new CultureInfo(CultureCodes.English);
            break;
}

下面是开关，下面是波纹管:

and bellow, out of switch :

Thread.CurrentThread.CurrentCulture = cultureInfo;

我对线程不熟悉，不确定我使用的是否正确.你能建议我如何正确地做到这一点吗?

I'm not familiar with Threads and i'm not sure if i used is correctly. Could you please suggest me how to do this it right way ?

推荐答案

您收到 Instance is read-only 错误，因为您试图通过下面的代码.

You get the Instance is read-only error because you are trying to alter a property on a a read-only culture, via the code below.

Thread.CurrentThread.CurrentCulture.DateTimeFormat = europeanDateFormat;

您可以通过其 IsReadOnly 属性检查区域性是否为只读；内置的是.

You can check whether a culture is readonly via its IsReadOnly property; the built-in ones are.

相反，您必须对当前活动的区域性进行克隆/复制，在该克隆上进行任何更改，然后将其分配给的 CurrentCulture 和/或 CurrentUICulture 当前线程.

Instead, you must make a clone/copy of the currently active culture, apply any changes on that clone and assign that one to the CurrentCulture and/or CurrentUICulture of the current thread.

var clone = Thread.CurrentThread.CurrentCulture.Clone() as CultureInfo;
clone.DateTimeFormat = CultureInfo.GetCultureInfo("it").DateTimeFormat;

Thread.CurrentThread.CurrentCulture = clone;
Thread.CurrentThread.CurrentUICulture = clone; 

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