this is the geidview code
< asp: GridView ID = "GridView1"
runat = "server"
AutoGenerateColumns = "False"
DataKeyNames = "studentID,startDate"
DataSourceID = "SqlDataSource1"
Width = "1230px"
BackColor = "White"
BorderColor = "#CCCCCC"
BorderStyle = "None"
BorderWidth = "1px"
CellPadding = "4"
ForeColor = "Black"
OnRowCommand = "GridView1_RowCommand"
OnRowDataBound = "OnRowDataBound"
OnPreRender = "gridView_PreRender" >
< Columns >
< asp: BoundField DataField = "firstName"
HeaderText = "First Name"
SortExpression = "firstName" / >
< asp: BoundField DataField = "lastName"
HeaderText = "Last Name"
SortExpression = "lastName" / >
< asp: BoundField DataField = "studentID"
HeaderText = "Student ID"
ReadOnly = "True"
SortExpression = "studentID" / >
< asp: BoundField DataField = "startDate"
HeaderText = "Start Date"
SortExpression = "startDate"
dataformatstring = "{0:yyyy-MM-dd}" / >
< asp: BoundField DataField = "endDate"
HeaderText = "End Date"
SortExpression = "endDate"
dataformatstring = "{0:yyyy-MM-dd}" / >
< asp: BoundField DataField = "trainingPlace"
HeaderText = "Training Place"
SortExpression = "trainingPlace" / >
< asp: BoundField DataField = "absenceDays"
HeaderText = "Absence Days"
SortExpression = "absenceDays" / >
< asp: BoundField DataField = "evaluation"
HeaderText = "Evaluation"
SortExpression = "evaluation" / >
< asp: BoundField DataField = "comment"
HeaderText = "Comment"
SortExpression = "comment" / >
< asp: ButtonField ButtonType = "Image"
CommandName = "redirect_edit"
HeaderText = "Edit"
ImageUrl = "~/images/table_Edit.png"
Text = "Edit"
ShowHeader = "True" / >
< asp: ButtonField ButtonType = "Image"
CommandName = "redirect_delete"
HeaderText = "Delete"
ImageUrl = "~/images/table_delete.png"
Text = "Delete" / >
< asp: ButtonField ButtonType = "Image"
CommandName = "sendEmail"
HeaderText = "Certificate"
ImageUrl = "~/images/table_certificate.png"
Text = "Certificate"
ItemStyle - HorizontalAlign = "Center" / >
< /Columns>
<FooterStyle BackColor="#CCCC99" ForeColor="Black" / >
< HeaderStyle BackColor = "#4DA3B0"
Font - Bold = "True"
ForeColor = "White" / >
< PagerStyle BackColor = "White"
ForeColor = "Black"
HorizontalAlign = "Right" / >
< SelectedRowStyle BackColor = "#CC3333"
Font - Bold = "True"
ForeColor = "White" / >
< SortedAscendingCellStyle BackColor = "#F7F7F7" / >
< SortedAscendingHeaderStyle BackColor = "#4B4B4B" / >
< SortedDescendingCellStyle BackColor = "#E5E5E5" / >
< SortedDescendingHeaderStyle BackColor = "#242121" / >
< /asp:GridView>
<asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="Data Source=WESAM\SQLEXPRESS;Initial Catalog=CAMSIS;Integrated Security=True" ProviderName="System.Data.SqlClient"></asp: SqlDataSource >
< /td>
我正在根据所选学生ID或下拉列表中所选项目编写网格视图更改的代码。话虽如此，我的代码并没有正常工作。我已经尝试了一切，但没有运气。似乎gridview显示页面加载中的第一个查询并忽略其他所有内容。 下面是我的代码。非常感谢您的帮助：）
SqlConnection myCon = new SqlConnection(@"Data Source=*****;Initial Catalog=CAMSIS;Integrated Security=True");
string grade; //This variable is used to distinct the failed students among the passed ones & to hide the certificate button
int department_selected;
protected void Page_Load(object sender, EventArgs e) {
idTextBox.Text = "";
DepDropDownList.SelectedIndex = 0;
if (!Page.IsPostBack) //To display the user's profile information once the page loaded
{
myCon.Open();
SqlDataAdapter daTa = new SqlDataAdapter(" select depName from Department", myCon);
// To copy the department names into an array
DataTable dt1 = new DataTable();
daTa.Fill(dt1);
// Foreach loop to terate through the department names array and add the names to the department dropdown list
foreach(DataRow row in dt1.Rows) {
DepDropDownList.Items.Add(row["depName"].ToString());
}
SqlDataSource1.SelectCommand = "SELECT Intern.firstName, Intern.lastName, Rotation.studentID, Rotation.startDate, Rotation.endDate, Rotation.trainingPlace, Rotation.absenceDays, Rotation.evaluation, Rotation.comment FROM Intern INNER JOIN Rotation ON Intern.studentID = Rotation.studentID";
myCon.Close();
}
}
protected void Button2_Click(object sender, EventArgs e) {
myCon.Open();
if (DepDropDownList.SelectedIndex == 0 && idTextBox.Text == "") {
SqlDataSource1.SelectCommand = "SELECT Intern.firstName, Intern.lastName, Rotation.studentID, Rotation.startDate, Rotation.endDate, Rotation.trainingPlace, Rotation.absenceDays, Rotation.evaluation, Rotation.comment FROM Intern INNER JOIN Rotation ON Intern.studentID = Rotation.studentID inner join department on intern.depNumber=Department.depNumber";
Response.Write("<script language='javascript'>window.alert('1');window.location='deanInternshipSchedule.aspx';</script>");
} else if (!string.IsNullOrEmpty(idTextBox.Text)) {
// SqlDataSource1.SelectCommand = "SELECT Intern.firstName, Intern.lastName, Rotation.studentID, Rotation.startDate, Rotation.endDate, Rotation.trainingPlace, Rotation.absenceDays, Rotation.evaluation, Rotation.comment FROM Intern INNER JOIN Rotation ON Intern.studentID = Rotation.studentID inner join department on intern.depNumber=Department.depNumber where Intern.studentID=" + idTextBox.Text.ToString().Trim() + "";
Response.Write("<script language='javascript'>window.alert('2');window.location='deanInternshipSchedule.aspx';</script>");
} else if ((DepDropDownList.SelectedIndex != 0) && (string.IsNullOrEmpty(idTextBox.Text))) {
Response.Write("<script language='javascript'>window.alert('3');window.location='deanInternshipSchedule.aspx';</script>");
//SqlDataSource1.SelectCommand = "SELECT Intern.firstName, Intern.lastName, Rotation.studentID, Rotation.startDate, Rotation.endDate, Rotation.trainingPlace, Rotation.absenceDays, Rotation.evaluation, Rotation.comment FROM Intern INNER JOIN Rotation ON Intern.studentID = Rotation.studentID inner join department on intern.depNumber=Department.depNumber WHERE Department.depName='" + DepDropDownList.SelectedValue.ToString() + "'";
}
myCon.Close();
}