[英]Multiple STA (Single Thread Apartment ) is not working in asp.net web application
[英]Exception: Single Thread Apartment (STA) in asp.net website
我在asp.net网络表单中有以下方法:
public partial class currencies : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
public class Rate
{
public string to { get; set; }
public string from { get; set; }
public double rate { get; set; }
}
double ConvertedAmount { get; set; }
public void Convert(object sender, EventArgs e)
{
DateTime theDate = DateTime.UtcNow;
string todayDateTime = theDate.ToString("f");
double amount = 0d;
if (double.TryParse(txtAmount.Text.Trim(), out amount))
{
string url = string.Format("http://rate-exchange.appspot.com/currency?from={0}&to={1}", ddlFrom.SelectedItem.Value, ddlTo.SelectedItem.Value);
WebClient client = new WebClient();
string rates = client.DownloadString(url);
Rate rate = new JavaScriptSerializer().Deserialize<Rate>(rates);
ConvertedAmount = amount * rate.rate;
Label1.Text = ddlFrom.SelectedItem.Value + ": " + amount;
Label2.Text = ddlTo.SelectedItem.Value + ": " + ConvertedAmount;
Label3.Text = "Rate as at " + todayDateTime + " is:";
Label4.Text = " 1 " + ddlFrom.SelectedItem.Value + " = " + rate.rate + " " + ddlTo.SelectedItem.Value;
}
else
{
ClientScript.RegisterStartupScript(this.GetType(), "alert", "alert('Invalid amount value.');", true);
}
}
protected void Button1_Click(object sender, EventArgs e)
{
Clipboard.SetText(ConvertedAmount.ToString());
}
}
当我单击按钮1将结果复制到剪贴板时,我得到一个例外:在调用OLE之前,必须将当前线程设置为单线程单元(STA)模式。 这是我第一次处理这样的事情。 我应该怎么做才能解决这个问题? 感谢您的帮助。
如MSDN所述,
Clipboard类只能在设置为单线程单元(STA)模式的线程中使用。
不需要在ASP.NET中设置STA。 但是您确定要在服务器端的剪贴板上进行操作吗? 您是否知道它将在服务器剪贴板上运行,而不是在客户端剪贴板上运行?
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