【发布时间】：2014-01-16 11:45:44
【问题描述】：
它以前工作过，我可以在网站上看到Gridview。但现在，我再也看不到它了。我不知道我在代码中做了什么改动。
在页面 SI.aspx 我有：
<asp:gridview ID="Gridview1" runat="server" ShowFooter="true" AutoGenerateColumns="false"
style="margin-top: 0px" CssClass="tb" HorizontalAlign="Center"
>
<Columns>
<asp:BoundField DataField="RowNumber" HeaderText="SI_id" />
<asp:TemplateField HeaderText="CTNS_NO">
<ItemTemplate>
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="SEAL_NO">
<ItemTemplate>
<asp:TextBox ID="TextBox2" runat="server"></asp:TextBox>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="PCS">
<ItemTemplate>
<asp:TextBox ID="TextBox3" runat="server"></asp:TextBox>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="W.G.">
<ItemTemplate>
<asp:TextBox ID="TextBox4" runat="server"></asp:TextBox>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="CBM">
<ItemTemplate>
<asp:TextBox ID="TextBox5" runat="server"></asp:TextBox>
</ItemTemplate>
<FooterStyle HorizontalAlign="Right" />
<FooterTemplate>
<asp:Button ID="ButtonAdd" runat="server" Text="Add New Line"
onclick="ButtonAdd_Click" CssClass="btn"/>
</FooterTemplate>
</asp:TemplateField>
</Columns>
</asp:gridview>
我想我在后面的代码中更改了一些内容，这就是无法显示 gridview 的原因。 这是 SI.aspx.cs 背后的代码：
private void SetInitialRow()
{
try
{
DataTable dt = new DataTable();
DataRow dr = null;
dt.Columns.Add(new DataColumn("RowNumber", typeof(string)));
dt.Columns.Add(new DataColumn("CTNS_NO", typeof(string)));
dt.Columns.Add(new DataColumn("SEAL_NO", typeof(string)));
dt.Columns.Add(new DataColumn("PCS", typeof(string)));
dt.Columns.Add(new DataColumn("[W.G.]", typeof(string)));
dt.Columns.Add(new DataColumn("CBM", typeof(string)));
dr = dt.NewRow();
dr["RowNumber"] = 1;
dr["CTNS_NO"] = string.Empty;
dr["SEAL_NO"] = string.Empty;
dr["PCS"] = string.Empty;
dr["[W.G.]"] = string.Empty;
dr["CBM"] = string.Empty;
dt.Rows.Add(dr);
//Store the DataTable in ViewState
ViewState["SI"] = dt;
Gridview1.DataSource = dt;
Gridview1.DataBind();
}
catch
{
}
}
private void AddNewRowToGrid()
{
try
{
int rowIndex = 0;
if (ViewState["SI"] != null)
{
DataTable dtCurrentTable = (DataTable)ViewState["SI"];
DataRow drCurrentRow = null;
if (dtCurrentTable.Rows.Count > 0)
{
for (int i = 1; i <= dtCurrentTable.Rows.Count; i++)
{
//extract the TextBox values
TextBox box1 = (TextBox)Gridview1.Rows[rowIndex].Cells[1].FindControl("TextBox1");
TextBox box2 = (TextBox)Gridview1.Rows[rowIndex].Cells[2].FindControl("TextBox2");
TextBox box3 = (TextBox)Gridview1.Rows[rowIndex].Cells[3].FindControl("TextBox3");
TextBox box4 = (TextBox)Gridview1.Rows[rowIndex].Cells[4].FindControl("TextBox4");
TextBox box5 = (TextBox)Gridview1.Rows[rowIndex].Cells[5].FindControl("TextBox5");
drCurrentRow = dtCurrentTable.NewRow();
drCurrentRow["RowNumber"] = i + 1;
dtCurrentTable.Rows[i - 1]["CTNS_NO"] = box1.Text;
dtCurrentTable.Rows[i - 1]["SEAL_NO"] = box2.Text;
dtCurrentTable.Rows[i - 1]["PCS"] = box3.Text;
dtCurrentTable.Rows[i - 1]["[W.G.]"] = box4.Text;
dtCurrentTable.Rows[i - 1]["CBM"] = box5.Text;
System.Data.SqlClient.SqlConnection sqlConnection1 = new System.Data.SqlClient.SqlConnection(ConfigurationManager.ConnectionStrings["EPSYLOG_DBBConnectionString"].ConnectionString);
System.Data.SqlClient.SqlCommand cmd = new System.Data.SqlClient.SqlCommand();
cmd.CommandType = System.Data.CommandType.Text;
cmd.CommandText = "INSERT into SI ([CTNS_NO],[SEAL_NO],[PCS],[W.G.],[CBM],[name],[bk_nbr],[shipper],[cons],[pol],[pod],[notify],[size]) values('" + box1.Text + "','" + box2.Text + "','" + box3.Text + "','" + box4.Text + "','" + box5.Text + "','" + name.Text + "','" + bn.Text + "','" + shp.Text + "','" + cng.Text + "','" + pol.Text + "','" + POD.Text + "','" + notif.Text + "','" + sz.Text + "')";
cmd.Connection = sqlConnection1;
sqlConnection1.Open();
cmd.ExecuteNonQuery();
sqlConnection1.Close();
rowIndex++;
}
dtCurrentTable.Rows.Add(drCurrentRow);
ViewState["SI"] = dtCurrentTable;
Gridview1.DataSource = dtCurrentTable;
Gridview1.DataBind();
}
}
else
{
Response.Write("ViewState is null");
}
//Set Previous Data on Postbacks
SetPreviousData();
}
catch{ }
}
private void SetPreviousData()
{
try
{
int rowIndex = 0;
if (ViewState["SI"] != null)
{
DataTable dt = (DataTable)ViewState["SI"];
if (dt.Rows.Count > 0)
{
for (int i = 0; i < dt.Rows.Count; i++)
{
TextBox box1 = (TextBox)Gridview1.Rows[rowIndex].Cells[1].FindControl("TextBox1");
TextBox box2 = (TextBox)Gridview1.Rows[rowIndex].Cells[2].FindControl("TextBox2");
TextBox box3 = (TextBox)Gridview1.Rows[rowIndex].Cells[3].FindControl("TextBox3");
TextBox box4 = (TextBox)Gridview1.Rows[rowIndex].Cells[4].FindControl("TextBox4");
TextBox box5 = (TextBox)Gridview1.Rows[rowIndex].Cells[5].FindControl("TextBox5");
box1.Text = dt.Rows[i]["CTNS_NO"].ToString();
box2.Text = dt.Rows[i]["SEAL_NO"].ToString();
box3.Text = dt.Rows[i]["PCS"].ToString();
box4.Text = dt.Rows[i]["[W.G.]"].ToString();
box5.Text = dt.Rows[i]["CBM"].ToString();
rowIndex++;
}
}
}
}
catch
{ }
}
protected void Page_Load(object sender, EventArgs e)
{
Gridview1.DataBind();
if (!Page.IsPostBack)
{
SetInitialRow();
}
try
{
if (Session["MySession"] == "")
{
Response.Redirect("authentication.aspx");
}
else
{
mail.Text = Session["e"].ToString();
}
}
catch
{
Response.Redirect("authentication.aspx");
}
try
{
name.Text = Session["MySession"].ToString();
bn.Text = Convert.ToString(Request.QueryString["arg1"]);
shp.Text = Convert.ToString(Request.QueryString["arg2"]);
cng.Text = Convert.ToString(Request.QueryString["arg3"]);
pol.Text = Convert.ToString(Request.QueryString["arg4"]);
POD.Text = Convert.ToString(Request.QueryString["arg5"]);
notif.Text = Convert.ToString(Request.QueryString["arg6"]);
}
catch
{
Response.Redirect("authentication.aspx");
}
}
protected void ButtonAdd_Click(object sender, EventArgs e)
{
AddNewRowToGrid();
}
这是 Gridview 的样子，它是空的，我们应该填充它并将其添加到数据库中：
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