您是否尝试过为这两个网站设置不同的应用程序池？看起来它试图变得“聪明”并得出结论，这两个虚拟目录实际上是同一个网站。
如果一切都失败了，您可以重写 ASP.NET 手动生成的 FORM 标记中的回发 URL。使用 App_Browsers 文件和 ControlAdapter 可能是最干净的方法。
我有一个这样的 ControlAdapter 实现示例，尽管它旨在与 URL 重写一起使用，以防止在回发时恢复到实际的幕后 URL。但是，我认为它可以开箱即用地解决您的问题
public class FormRewriterControlAdapter : System.Web.UI.Adapters.ControlAdapter
{
protected override void Render(HtmlTextWriter writer)
{
base.Render(new RewriteFormHtmlTextWriter(writer));
}
}
public class RewriteFormHtmlTextWriter : HtmlTextWriter
{
private const string contextItemKey = "FormActionWritten";
public RewriteFormHtmlTextWriter(HtmlTextWriter writer) : base(writer)
{
InnerWriter = writer.InnerWriter;
}
public RewriteFormHtmlTextWriter(System.IO.TextWriter writer) : base(writer)
{
base.InnerWriter = writer;
}
public override void WriteAttribute(string name, string value, bool fEncode)
{
// If the attribute we are writing is the "action" attribute, and we are not on a sub-control,
// then replace the value to write with the raw URL of the request - which ensures that we'll
// preserve the PathInfo value on postback scenarios
if (name == "action" && !HttpContext.Current.Items.Contains(contextItemKey))
{
// Use the Request.RawUrl property to retrieve the un-rewritten URL
value = HttpContext.Current.Request.RawUrl;
HttpContext.Current.Items[contextItemKey] = true;
}
base.WriteAttribute(name, value, fEncode);
}
}
Form.browser文件：
<browsers>
<browser refID="Default">
<controlAdapters>
<adapter controlType="System.Web.UI.HtmlControls.HtmlForm" adapterType="FormRewriterControlAdapter" />
</controlAdapters>
</browser>
</browsers>