[英]How to Remove Duplicates By Column in ASP.net GridView
我的ASPX頁面中有以下GridView
<asp:GridView ID="tbl_report" runat="server" AutoGenerateColumns="False" GridLines="None" CssClass="CSSTable">
<Columns>
<asp:BoundField DataField="StudentID" HeaderText="Student ID" HeaderStyle-Width="300px"/>
<asp:BoundField DataField="FirstName" HeaderText="First Name" HeaderStyle-Width="250px"/>
<asp:BoundField DataField="LastName" HeaderText="Last Name" HeaderStyle-Width="250px"/>
<asp:BoundField DataField="ExamID" HeaderText="Exam ID" HeaderStyle-Width="250px"/>
<asp:BoundField DataField="ExamName" HeaderText="Exam Name" HeaderStyle-Width="250px"/>
<asp:BoundField DataField="SubjectName" HeaderText="Subject" HeaderStyle-Width="250px"/>
<asp:BoundField DataField="Marks" HeaderText="Marks" HeaderStyle-Width="100px"/>
<asp:BoundField DataField="Result" HeaderText="Result" HeaderStyle-Width="100px"/>
</Columns>
</asp:GridView>
通過以下方法生成的
protected void view_Report(object sender, EventArgs e)
{
String classname = txt_classname.SelectedValue;
db = new DBConnection();
db.getConnection();
dt = db.executeSelectQuery("select s.StudentID,s.FirstName,s.LastName,eh.ExamID,eh.ExamName,sub.SubjectName,se.Marks,se.Result from ExamHeader eh inner join Grade g on eh.GradeName = g.GradeName inner join Class c on c.GradeName = g.GradeName inner join StudentToExam se on se.ExamID = eh.ExamID inner join Student s on s.StudentID = se.StudentID inner join Subject sub on eh.ExamSubjectID = sub.SubjectID where c.ClassName = '"+classname+"' and eh.ExamPublished = 'Yes' and eh.ExamDate <= GETDATE() order by s.StudentID");
tbl_report.DataSource = dt;
tbl_report.DataBind();
}
例如我得到以下結果
我想要做的是刪除重復的數據,並在出現這種情況的地方將這三列留空,例如在上面我四舍五入的情況下。 請給我建議一種方法。
我認為以下邏輯將對您有所幫助。您需要對RowDataBound事件設置重復的列。
protected void view_Report(object sender, EventArgs e)
{
//=====Change Code===========================
ViewState["PrevRecordStudentID"] = 0;
ViewState["PrevRecordFirstName"] = "";
ViewState["PrevRecordLastName"] = "";
//=====Change Code===========================
String classname = txt_classname.SelectedValue;
db = new DBConnection();
db.getConnection();
dt = db.executeSelectQuery("select s.StudentID,s.FirstName,s.LastName,eh.ExamID,eh.ExamName,sub.SubjectName,se.Marks,se.Result from ExamHeader eh inner join Grade g on eh.GradeName = g.GradeName inner join Class c on c.GradeName = g.GradeName inner join StudentToExam se on se.ExamID = eh.ExamID inner join Student s on s.StudentID = se.StudentID inner join Subject sub on eh.ExamSubjectID = sub.SubjectID where c.ClassName = '"+classname+"' and eh.ExamPublished = 'Yes' and eh.ExamDate <= GETDATE() order by s.StudentID");
tbl_report.DataSource = dt;
tbl_report.DataBind();
}
//=====Add Code===========================
protected void tbl_report_RowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
if (e.Row.Cells[0].Text == Convert.ToString(ViewState["PrevRecordStudentID"]) && e.Row.Cells[1].Text == Convert.ToString(ViewState["PrevRecordFirstName"]) && e.Row.Cells[2].Text == Convert.ToString(ViewState["PrevRecordLastName"]))
{
e.Row.Cells[0].Text = "";
e.Row.Cells[1].Text = "";
e.Row.Cells[2].Text = "";
}
else
{
ViewState["PrevRecordStudentID"] = Convert.ToInt32(e.Row.Cells[0].Text) ;
ViewState["PrevRecordFirstName"] = Convert.ToString(e.Row.Cells[1].Text);
ViewState["PrevRecordLastName"] = Convert.ToString(e.Row.Cells[2].Text);
}
}
}
//=====Add Code===========================
//=====Change Code===========================
<asp:GridView ID="tbl_report" runat="server" AutoGenerateColumns="False"
GridLines="None" CssClass="CSSTable" onrowdatabound="tbl_report_RowDataBound">
//=====Change Code===========================
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