如何解决从线程— CSharp WPF启动时，模式弹出窗口失败
|| 要批量上传许多文件，我有CSharp WPF代码的一部分，该代码产生线程以允许并行上传文件。 如果上传发生错误，将使用MessageBox弹出一条消息。这很好。 但是最近，我们决定自定义MessageBox的外观。我发现，当使用ShowDialog（）打开新的自定义WPF MessageBox窗口时，抛出一个错误，提示无法启动GUI。仅在生成的线程中的代码尝试打开自定义消息窗口时才会发生这种情况-当从主线程打开自定义MessageBox时，我看不到问题。 我的临时解决方法是捕获自定义对话框启动时发生的所有错误，并替代性地调用标准MessageBox.Show（）以显示消息。这样可行。 我不确定为什么可以使用标准MessageBox.Show（），但不适用于自定义窗口。有办法解决这个问题吗？解决方法
通常（在任何GUI-API中）都不会从辅助线程调用GUI函数，并且不会在GUI线程上进行繁重的工作。
标准MessageBox在工作线程上工作的事实令人遗憾。
是的，您完全正确。在工作线程上发生某些需要向用户显示的事件时，向GUI线程发送一条通知（信号，事件，无论您的框架如何调用），并在其中显示消息。
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protected void chkAll_CheckedChanged(object sender,EventArgs e)
{
CheckBox chall = (CheckBox)sender;
for (int i = 0; i < GridView1.Rows.Count; i++)
{
CheckBox chSelect = (CheckBox)GridView1.Rows[i].FindControl(\"ChkSelect\");
if (chSelect != null)
{
chSelect.Checked = chall.Checked;
}
}
}
protected void chkSelect_CheckedChange(object sender,EventArgs e)
{
int i=0;
CheckBox chkAll = (CheckBox)GridView1.HeaderRow.FindControl(\"chkAll\");
for ( i = 0; i < GridView1.Rows.Count; i++)
{
CheckBox chkSelect = (CheckBox)GridView1.Rows[i].FindControl(\"ChkSelect\");
if(chkSelect!=null && !chkSelect.Checked )
if (chkAll != null)
{
chkAll.Checked = false;
}
break;
}
if (GridView1.Rows.Count == i && chkAll != null)
{
chkAll.Checked = true;
}
}
protected void ddlPaymentMode_SelectedIndexChanged(object sender,EventArgs e)
{
DropDownList ddlpaymode = (DropDownList)sender;
for (int i = 0; i < GridView1.Rows.Count; i++)
{
Label lblpaymode = (Label)GridView1.Rows[i].FindControl(\"lblPayAmt_Mode\");
CheckBox chpaymode = (CheckBox)GridView1.Rows[i].FindControl(\"ChkSelect\");
if (chpaymode.Checked)
{
lblpaymode.Text = ddlpaymode.SelectedItem.Text;
}
}
}
protected void ddlBankName_SelectedIndexChanged(object sender,EventArgs e)
{
DropDownList ddlBank = (DropDownList)sender;
for (int i = 0; i < GridView1.Rows.Count; i++)
{
CheckBox cselect = (CheckBox)GridView1.Rows[i].FindControl(\"ChkSelect\");
Label lblBankName = (Label)GridView1.Rows[i].FindControl(\"LblBank\");
if (cselect.Checked)
{
lblBankName.Text = ddlBank.SelectedItem.Text;
}
}
}
protected void btnaddbpc_Click(object sender,EventArgs e)
{
int temp = Convert.ToInt32(txtChequeNo.Text);
for (int i = 0; i < GridView1.Rows.Count; i++)
{
CheckBox chkselect = (CheckBox)GridView1.Rows[i].FindControl(\"ChkSelect\");
Label lblcheckno = (Label)GridView1.Rows[i].FindControl(\"LblCheque\");
if (chkselect.Checked)
{
lblcheckno.Text = Convert.ToString(temp);
temp++;
}
}
}
protected void dtnDelete_Click(object sender,EventArgs e)
{
for (int i = 0; i < GridView1.Rows.Count; i++)
{
CheckBox chkselect = (CheckBox)GridView1.Rows[i].FindControl(\"ChkSelect\");
Label lblcheckno = (Label)GridView1.Rows[i].FindControl(\"LblCheque\");
if (chkselect.Checked)
{
lblcheckno.Text = \"\";
}
}
}
protected void btnAddCDate_Click(object sender,EventArgs e)
{
for (int i = 0; i < GridView1.Rows.Count; i++)
{
Label lblchqdate = (Label)GridView1.Rows[i].FindControl(\"LblCheque_Date\");
CheckBox chkselect = (CheckBox)GridView1.Rows[i].FindControl(\"ChkSelect\");
if (chkselect.Checked)
{
lblchqdate.Text = TxtChequeDate.Text;
}
}
}
protected void btnRemovecDate_Click(object sender,EventArgs e)
{
for (int i = 0; i < GridView1.Rows.Count; i++)
{
Label lblchqdate = (Label)GridView1.Rows[i].FindControl(\"LblCheque_Date\");
CheckBox chkselect = (CheckBox)GridView1.Rows[i].FindControl(\"ChkSelect\");
if (chkselect.Checked)
{
lblchqdate.Text = \"\";
}
}
}
protected void GridView1_RowCommand(object sender,GridViewCommandEventArgs e)
{
if (e.CommandName == \"Modify\")
{
string ID = e.CommandArgument.ToString();
//Response.Redirect(\"Admin_Update_BinryPayment.aspx?id=\"+ID+\"&FromDate=\'\"+ txtfromdate.Text +\"\'&ToDate=\'\"+txttilldate.Text+\"\'\");
int Index = ((GridViewRow)((LinkButton)e.CommandSource).Parent.Parent).RowIndex;
CheckBox chksec = (CheckBox)GridView1.Rows[Index].FindControl(\"ChkSelect\");
Label lblANo = (Label)GridView1.Rows[Index].FindControl(\"Label2\");
Label lbAName = (Label)GridView1.Rows[Index].FindControl(\"Label3\");
Label lbACName = (Label)GridView1.Rows[Index].FindControl(\"Label3\");
Label lbacNo = (Label)GridView1.Rows[Index].FindControl(\"lblBankAccountNo\");
Label lbBankName = (Label)GridView1.Rows[Index].FindControl(\"LblBank\");
Label lbchqNo = (Label)GridView1.Rows[Index].FindControl(\"LblCheque\");
Label lbchqDate = (Label)GridView1.Rows[Index].FindControl(\"LblCheque_Date\");
Label lblChqAmt = (Label)GridView1.Rows[Index].FindControl(\"Label23\");
if (chksec.Checked)
{
txtABNo.Text = GridView1.Rows[Index].Cells[3].Text;
Dispatcher.BeginInvoke(DispatcherPriority.Background,(SendOrPostCallback)delegate {
// show your MB here
},null);
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