页面不会更改语言

Question

我的页面不会更改语言，有人可以看一下我的代码并告诉我我做错了什么，它总是使用默认语言

public partial class ChangeLanguage : BasePage
{
    protected void Page_Load(object sender, EventArgs e)
    {
        SortedDictionary<string, string> objDic = new SortedDictionary<string, string>();

        foreach (CultureInfo ObjectCultureInfo in CultureInfo.GetCultures(CultureTypes.SpecificCultures))
        {
            RegionInfo objRegionInfo = new RegionInfo(ObjectCultureInfo.Name);
            if (!objDic.ContainsKey(objRegionInfo.EnglishName))
            {
                objDic.Add(objRegionInfo.EnglishName, ObjectCultureInfo.Name);
            }
        }

        foreach (KeyValuePair<string, string> val in objDic)
        {
            ddlCountries.Items.Add(new ListItem(val.Key, val.Value));
        }

        ddlCountries.SelectedValue = (HttpContext.Current.Profile as ProfileCommon).Preferences.Culture;
    }

    protected void btnChangeLanguage_Click(object sender, EventArgs e)
    {
        ProfileCommon profile = HttpContext.Current.Profile as ProfileCommon;
        profile.Preferences.Culture = ddlCountries.SelectedValue;
    }
}
protected override void InitializeCulture()
  {
     string culture = (HttpContext.Current.Profile as ProfileCommon).Preferences.Culture;
     this.Culture = culture;
     this.UICulture = culture;
  }
Profile:
  <properties>
    <add name="FirstName" type="String"/>
    <add name="LastName" type="String"/>
    <add name="Gender" type="String"/>
    <add name="BirthDate" type="DateTime"/>
    <add name="Occupation" type="String"/>
    <add name="WebSite" type="String"/>
    <group name="Preferences">
      <add name="Culture" type="String" defaultValue="en-NZ" allowAnonymous="true"/>
    </group>
  </properties>

Answer 1

这里有几个问题，但主要的问题是您在Page_Load中会这样做：

ddlCountries.SelectedValue = (HttpContext.Current.Profile as ProfileCommon

然后在点击事件的事件处理程序中执行以下操作：

profile.Preferences.Culture = ddlCountries.SelectedValue;

对于您来说不幸的是，Page_Load事件在单击事件之前触发，并且由于Page_Load事件将dropdownlist的selectedvalue设置为Profile对象中已存储的值，然后保存了dropdownlist的selectedvalue（不再是您选择的值）。在点击按钮之前选择），实际上，您只是忽略所选值，而是继续使用默认值（或以前的值）。

将在下拉列表中选择值的代码移动到Page_PreRender（将其从Page_Load中删除），您会很好的（示例）：

    protected void Page_PreRender(object sender, EventArgs e)
{
    string culture = (HttpContext.Current.Profile as ProfileCommon).Preferences.Culture;
    if (ddlCountries.Items.FindByValue(culture) != null)
    {
        ddlCountries.SelectedValue = (HttpContext.Current.Profile as ProfileCommon).Preferences.Culture;
    }
}