我尝试在网格中添加一个新行，其中包含下拉列表。现在我尝试在添加新行但数据没有显示时将数据绑定到下拉列表。谁能告诉我我的代码有什么问题？
<asp:GridView ID="grdJournal" runat="server" ShowFooter="true" AutoGenerateColumns="false">
<Columns>
<asp:BoundField DataField="RowNumber" HeaderText="Row Number" />
<asp:TemplateField HeaderText="Date">
<ItemTemplate>
<asp:TextBox ID="lblDate" runat="server"></asp:TextBox>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Account">
<ItemTemplate>
<asp:DropDownList ID="ddlAccounts" runat="server"></asp:DropDownList>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Description">
<ItemTemplate>
<asp:TextBox ID="lblDescription" runat="server"></asp:TextBox>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Debit">
<ItemTemplate>
<asp:TextBox ID="lblDebit" runat="server"></asp:TextBox>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Credit">
<ItemTemplate>
<asp:TextBox ID="lblCredit" runat="server"></asp:TextBox>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
我的代码隐藏就是这个
private void SetInitialRow()
{
DataTable dt = new DataTable();
DataRow dr = null;
dt.Columns.Add(new DataColumn("RowNumber", typeof(string)));
dt.Columns.Add(new DataColumn("colDate", typeof(string)));
dt.Columns.Add(new DataColumn("colAccount", typeof(string)));
dt.Columns.Add(new DataColumn("colDescription", typeof(string)));
dt.Columns.Add(new DataColumn("colDebit", typeof(string)));
dt.Columns.Add(new DataColumn("colCredit", typeof(string)));
dr = dt.NewRow();
dr["RowNumber"] = 1;
dr["colDate"] = string.Empty;
dr["colAccount"] = string.Empty;
dr["colDescription"] = string.Empty;
dr["colDebit"] = string.Empty;
dr["colCredit"] = string.Empty;
dt.Rows.Add(dr);
//Store the DataTable in ViewState
ViewState["CurrentTable"] = dt;
grdJournal.DataSource = dt;
grdJournal.DataBind();
}
private void AddNewRowToGrid()
{
int rowIndex = 0;
if (ViewState["CurrentTable"] != null)
{
DataTable dtCurrentTable = (DataTable)ViewState["CurrentTable"];
DataRow drCurrentRow = null;
if (dtCurrentTable.Rows.Count > 0)
{
for (int i = 1; i <= dtCurrentTable.Rows.Count; i++)
{
//extract the TextBox values
TextBox lblDate = (TextBox)grdJournal.Rows[rowIndex].Cells[1].FindControl("lblDate");
DropDownList lblAccount = (DropDownList)grdJournal.Rows[rowIndex].Cells[2].FindControl("ddlAccounts");
TextBox lblDescription = (TextBox)grdJournal.Rows[rowIndex].Cells[3].FindControl("lblDescription");
TextBox lblDebit = (TextBox)grdJournal.Rows[rowIndex].Cells[3].FindControl("lblDebit");
TextBox lblCredit = (TextBox)grdJournal.Rows[rowIndex].Cells[3].FindControl("lblCredit");
Classes.CRUD obj = new Classes.CRUD();
lblAccount.DataSource = obj.ShowAllAccounts();
lblAccount.DataTextField = "Key";
lblAccount.DataValueField = "Value";
lblAccount.DataBind();
drCurrentRow = dtCurrentTable.NewRow();
drCurrentRow["RowNumber"] = i + 1;
//Setting Values to new Row
dtCurrentTable.Rows[i - 1]["colDate"] = lblDate.Text;
dtCurrentTable.Rows[i - 1]["colAccount"] = lblAccount.SelectedItem.Text;
dtCurrentTable.Rows[i - 1]["colDescription"] = lblDescription.Text;
dtCurrentTable.Rows[i - 1]["colDebit"] = lblDebit.Text;
dtCurrentTable.Rows[i - 1]["colCredit"] = lblCredit.Text;
rowIndex++;
}
dtCurrentTable.Rows.Add(drCurrentRow);
ViewState["CurrentTable"] = dtCurrentTable;
grdJournal.DataSource = dtCurrentTable;
grdJournal.DataBind();
}
}
else
{
Response.Write("ViewState is null");
}
//Set Previous Data on Postbacks
SetPreviousData();
}
private void SetPreviousData()
{
int rowIndex = 0;
if (ViewState["CurrentTable"] != null)
{
DataTable dt = (DataTable)ViewState["CurrentTable"];
if (dt.Rows.Count > 0)
{
for (int i = 0; i < dt.Rows.Count; i++)
{
TextBox lblDate = (TextBox)grdJournal.Rows[rowIndex].Cells[1].FindControl("lblDate");
DropDownList lblAccount = (DropDownList)grdJournal.Rows[rowIndex].Cells[2].FindControl("ddlAccounts");
TextBox lblDescription = (TextBox)grdJournal.Rows[rowIndex].Cells[3].FindControl("lblDescription");
TextBox lblDebit = (TextBox)grdJournal.Rows[rowIndex].Cells[3].FindControl("lblDebit");
TextBox lblCredit = (TextBox)grdJournal.Rows[rowIndex].Cells[3].FindControl("lblCredit");
lblDate.Text = dt.Rows[i]["colDate"].ToString();
// lblAccount.Text = dt.Rows[i]["colAccount"].ToString();
lblDescription.Text = dt.Rows[i]["colDescription"].ToString();
lblDebit.Text = dt.Rows[i]["colDebit"].ToString();
lblCredit.Text = dt.Rows[i]["colCredit"].ToString();
rowIndex++;
}
}
}
}
protected void btnSubmit_Click(object sender, EventArgs e)
{
AddNewRowToGrid();
}
protected void Page_Load(object sender, EventArgs e)
{
Classes.CRUD obj = new Classes.CRUD();
#region Binding Events
if (!Page.IsPostBack)
{
SetInitialRow();
ddlType.DataTextField = "Value";
ddlType.DataValueField = "Key";
ddlType.DataSource = obj.ShowTypesOfTransactions();
ddlType.DataBind();
}
#endregion
}
答案 0 :(得分：1)
解决了它。
private void SetPreviousData()
{
int rowIndex = 0;
if (ViewState["CurrentTable"] != null)
{
DataTable dt = (DataTable)ViewState["CurrentTable"];
if (dt.Rows.Count > 0)
{
for (int i = 0; i < dt.Rows.Count; i++)
{
TextBox TextBoxName = (TextBox)grvStudentDetails.Rows[rowIndex].Cells[1].FindControl("txtName");
TextBox TextBoxAge = (TextBox)grvStudentDetails.Rows[rowIndex].Cells[2].FindControl("txtAge");
TextBox TextBoxAddress =
(TextBox)grvStudentDetails.Rows[rowIndex].Cells[3].FindControl("txtAddress");
RadioButtonList RBLGender =
(RadioButtonList)grvStudentDetails.Rows[rowIndex].Cells[4].FindControl("RBLGender");
DropDownList DrpQualification =
(DropDownList)grvStudentDetails.Rows[rowIndex].Cells[5].FindControl("drpQualification");
//Added these lines
Classes.CRUD obj = new Classes.CRUD();
DrpQualification.DataSource = obj.ShowAllAccounts();
DrpQualification.DataBind();
//****************
TextBoxName.Text = dt.Rows[i]["Col1"].ToString();
TextBoxAge.Text = dt.Rows[i]["Col2"].ToString();
TextBoxAddress.Text = dt.Rows[i]["Col3"].ToString();
RBLGender.SelectedValue = dt.Rows[i]["Col4"].ToString();
DrpQualification.SelectedValue = dt.Rows[i]["Col5"].ToString();
rowIndex++;
}
}
}
}