在下面的代码中,iam执行在db.Everything中插入值的功能。工作正常但事情是如果我按F5或Ctrl + F5重新加载页面并再次插入相同的值。我只是清空了文本框的值,但它不起作用。如何防止重复插入..
先谢谢。
protected void btnAddNewQuestion_Click(object sender, EventArgs e)
{
try
{
SqlCommand cmd = new SqlCommand("Usp_insertNewQuestion", con);
cmd.CommandType = CommandType.StoredProcedure;
cmd.Parameters.Add("@AppID", SqlDbType.Int).Value = applicationId;
cmd.Parameters.Add("@TenantID", SqlDbType.Int).Value = 1;
cmd.Parameters.Add("@Questions", SqlDbType.VarChar).Value = txtNewQuestion.Text;
cmd.Parameters.Add("@QuestionType", SqlDbType.VarChar).Value = ddlNewQuestionType.Text;
cmd.Parameters.Add("@AudioPath", SqlDbType.VarChar).Value = txtNewAudioPath.Text;
cmd.Parameters.Add("@QuestionStatus", SqlDbType.Int).Value = Int32.Parse(rdoNewQuestionStatus.SelectedItem.Value);
cmd.Parameters.Add("@DataType", SqlDbType.VarChar).Value = ddlNewQuestionDataType.Text;
cmd.Parameters.Add("@UserField", SqlDbType.VarChar).Value = ddlNewUserField.Text;
con.Open();
cmd.ExecuteNonQuery();
}
catch (Exception err)
{
Response.Write(err.Message);
}
finally
{
con.Close();
}
//string type = Page.Request.Form["hdnAddQuestionField"].ToString();
// if (type == "Security Question")
// getSecurityQuestions();
//if (type == "Personal Identity")
// getPersonalIdentityQuestions();
//if (type == "Past History")
// getPastHistoryQuestions();
txtNewQuestion.Text = string.Empty;
ddlNewQuestionType.Text = string.Empty;
txtNewAudioPath.Text =string.Empty;
rdoNewQuestionStatus.SelectedItem.Value = string.Empty;
ddlNewQuestionDataType.Text = string.Empty;
ddlNewUserField.Text = string.Empty;
}
答案 0 :(得分:2)
避免此问题的一种方法是在发布后重定向到同一页面(Response.Redirect("[current_url]")
)。此模式称为PRG(Post / Redirect / Get)。通过这种方式,浏览器刷新将在POST后产生GET,从而避免那些有问题的重复提交。
有关此模式的更多详细信息here