我重复这个问题是因为我无法从任何地方找到答案。
我在 .aspx 页面中有一个 GridView。我想根据 aspx.cs BindData() 方法隐藏列。
我试过使用下面的代码但无法隐藏。我在 C# 中使用 Asp.net。
下面是我的带有列的 GridView，我还包含了 Button 点击代码。
如果我选择，我会得到这个else-if Ladder下面的“T-L”错误
DataBinding:“System.Data.DataRowView”不包含名为“tutorial”的属性。
我在 .aspx 中标记了一个测试用例错误
为了临时让我的程序工作，我使用 4 个 gridview 来绑定(bind) 4 个查询，这是不可行的...我如何根据条件隐藏模板字段不可见... 请帮助我..
<GridView>
<Columns>
<asp:BoundField DataField="id" HeaderText="Id" SortExpression="id"
Visible="false" />
<asp:TemplateField HeaderText="RollNo" >
<ItemTemplate>
<%# Eval("st_rollno")%>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox ID="tbsturollno" runat="Server"
Text='<%# Eval("st_rollno") %>'></asp:TextBox>
</EditItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Name">
<ItemTemplate>
<%# Eval("st_name")%>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox ID="tbstuname" runat="Server"
Text='<%# Eval("st_name") %>'></asp:TextBox>
</EditItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Theory">
<ItemTemplate>
<%# Eval("theory")%>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox ID="tbtheory" runat="Server"
Text='<%# Eval("theory") %>'></asp:TextBox>
</EditItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Total" >
<ItemTemplate>
<%# Eval("ttotal")%>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox ID="tbtheorytotal" runat="Server"
Text='<%# Eval("ttotal") %>'></asp:TextBox>
</EditItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Lab" >
<ItemTemplate>
<%# Eval("lab")%>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox ID="tblab" runat="Server"
Text='<%# Eval("lab") %>'>
</asp:TextBox>
</EditItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Total" >
<ItemTemplate>
<%# Eval("ltotal")%>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox ID="tblabtotal" runat="Server"
Text='<%# Eval("ltotal") %>'></asp:TextBox>
</EditItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Tutorial" >
<ItemTemplate>
*Error is HERE <%# Eval("tutorial")%>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox ID="tbtutorial" runat="Server"
Text='<%# Eval("tutorial") %>'></asp:TextBox>
</EditItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Total" >
<ItemTemplate>
<%# Eval("tutotal")%>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox ID="tbtutorialtotal" runat="Server"
Text='<%# Eval("tutotal") %>'></asp:TextBox>
</EditItemTemplate>
</asp:TemplateField>
</Columns>
</GridView>
private void BindData()
{
DataTable dt = new DataTable();
using (SqlConnection con = new SqlConnection(ConnectionString))
{
if (stype.Equals("L"))
{
query = "SELECT [id], [st_rollno], [st_name], [lab], [ltotal] FROM [Attendence_Subject_Wise] WHERE (([branch_name] = @branch_name) AND ([scode] = @scode) AND ([sem_no] = @sem_no) AND ([sess_no] = @sess_no)) ORDER BY [st_rollno]";
GridView1.Columns[3].Visible = false;
GridView1.Columns[4].Visible = false;
GridView1.Columns[7].Visible = false;
GridView1.Columns[8].Visible = false;
}
else if (stype.Equals("T"))
{
query = "SELECT [id], [st_rollno], [st_name], [theory], [ttotal] FROM [Attendence_Subject_Wise] WHERE (([branch_name] = @branch_name) AND ([scode] = @scode) AND ([sem_no] = @sem_no) AND ([sess_no] = @sess_no)) ORDER BY [st_rollno]";
GridView1.Columns[5].Visible = false;
GridView1.Columns[6].Visible = false;
GridView1.Columns[7].Visible = false;
GridView1.Columns[8].Visible = false;
}
else if (stype.Equals("T-L"))
{
GridView1.Columns[7].Visible = false;
GridView1.Columns[8].Visible = false;
query = "SELECT [id], [st_rollno], [st_name], [theory], [ttotal], [lab], [ltotal] FROM [Attendence_Subject_Wise] WHERE (([branch_name] = @branch_name) AND ([scode] = @scode) AND ([sem_no] = @sem_no) AND ([sess_no] = @sess_no)) ORDER BY [st_rollno]";
}
else
{
query = "SELECT [id], [st_rollno], [st_name],[theory], [ttotal], [lab], [ltotal], [tutorial], [tutotal] FROM [Attendence_Subject_Wise] WHERE (([branch_name] = @branch_name) AND ([scode] = @scode) AND ([sem_no] = @sem_no) AND ([sess_no] = @sess_no)) ORDER BY [st_rollno]";
}
com = new SqlCommand(query);
com.Parameters.Add("@branch_name", dept);
com.Parameters.Add("@scode", dpsubject.SelectedItem.Text.ToString());
com.Parameters.Add("@sem_no", Int32.Parse(dpsemno.SelectedItem.Text.ToString()));
com.Parameters.Add("@sess_no",Int32.Parse(dpsessional.SelectedItem.Text.ToString()));
using (SqlDataAdapter sda = new SqlDataAdapter())
{
com.Connection = con;
con.Open();
sda.SelectCommand = com;
sda.Fill(dt);
GridView1.DataSource = dt;
GridView1.DataBind();
con.Close();
}
}
}
protected void bsubmit_Click(object sender, EventArgs e)
{
this.BindData();
}
最佳答案
尝试让您的查询仍然为您要隐藏的每一列返回一个结果，即使您不会使用这些值。在 stype 为“T-L”的查询中，将 query 从此更改为:
query = "SELECT [id], [st_rollno], [st_name], [theory], [ttotal], [lab], [ltotal] FROM [Attendence_Subject_Wise] WHERE (([branch_name] = @branch_name) AND ([scode] = @scode) AND ([sem_no] = @sem_no) AND ([sess_no] = @sess_no)) ORDER BY [st_rollno]";
对此:
query = "SELECT [id], [st_rollno], [st_name], [theory], [ttotal], [lab], [ltotal], '' as tutorial, '' as tutotal FROM [Attendence_Subject_Wise] WHERE (([branch_name] = @branch_name) AND ([scode] = @scode) AND ([sem_no] = @sem_no) AND ([sess_no] = @sess_no)) ORDER BY [st_rollno]";
编辑:
要隐藏该列，请将以下方法添加到后面的代码中:
protected void GridView_DataBound(object sender, GridViewRowEventArgs e)
{
if (stype.Equals("T-L"))
{
MyGridView.Columns[7].Visible = false;
MyGridView.Columns[8].Visible = false;
}
}
并订阅 GridView 上的 DataBound 事件。请注意，我向 GridView 添加了一个 ID，以便我可以从后面的代码中引用它。
<GridView ID="MyGridView" OnDataBound="GridView_DataBound">
关于c# - 如何在gridview中隐藏模板字段，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/15462961/