この回答は、@ rastatingの素晴らしい回答を少し拡張したものです。心配することなく、.NETのすべてのバージョンで次のコードを使用できます。
public static void SetDefaultCulture(CultureInfo culture)
{
Type type = typeof (CultureInfo);
try
{
// Class "ReflectionContext" exists from .NET 4.5 onwards.
if (Type.GetType("System.Reflection.ReflectionContext", false) != null)
{
type.GetProperty("DefaultThreadCurrentCulture")
.SetValue(System.Threading.Thread.CurrentThread.CurrentCulture,
culture, null);
type.GetProperty("DefaultThreadCurrentUICulture")
.SetValue(System.Threading.Thread.CurrentThread.CurrentCulture,
culture, null);
}
else //.NET 4 and lower
{
type.InvokeMember("s_userDefaultCulture",
BindingFlags.SetField | BindingFlags.NonPublic | BindingFlags.Static,
null,
culture,
new object[] {culture});
type.InvokeMember("s_userDefaultUICulture",
BindingFlags.SetField | BindingFlags.NonPublic | BindingFlags.Static,
null,
culture,
new object[] {culture});
type.InvokeMember("m_userDefaultCulture",
BindingFlags.SetField | BindingFlags.NonPublic | BindingFlags.Static,
null,
culture,
new object[] {culture});
type.InvokeMember("m_userDefaultUICulture",
BindingFlags.SetField | BindingFlags.NonPublic | BindingFlags.Static,
null,
culture,
new object[] {culture});
}
}
catch
{
// ignored
}
}
}