新手提问：老是提示“当前上下文中不存在名称”，请帮忙解决！谢谢！
不知为什么老是出现：CS0103: 当前上下文中不存在名字“DomainName”，但我已经对过好几遍数据库，还有显示界面，名字都没有错！用Response.Write()也会出现这个错误！！应该是取不到TextBox里面的值吧！但我不会解决这个问题！只好请教一下那里的有历练的大侠了！谢谢！拷贝内容到剪贴板
源代码:
PageRankotected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
string DataType = " server=localhost;Initial Catalog=Domain;user id=sa;password=123456 ";
string selectSQL = " Select * From DomainList Where ID=" + Request.QueryString["ID"] + " ";
SqlConnection Conn = new SqlConnection(DataType);
SqlCommand selectCmd = new SqlCommand(selectSQL, Conn);
try
{
Conn.Open();
FormView1.DataSource = selectCmd.ExecuteReader();
FormView1.DataBind();
}
catch (Exception err)
{
lblMessage.Text = err.Message;
}
finally
{
Conn.Close();
}
}
}
PageRankotected void btnAdd_Click(object sender, EventArgs e)
{
string DataType = " server=localhost;Initial Catalog=Domain;user id=sa;password=123456 ";
string updateSQL = " update DomainList set DomainName='" + DomainName.Text + "',EditDate='" + DateTime.Now.ToShortDateString() + "' Where ID='" + Request.QueryString["ID"] + "' ";
SqlConnection Conn = new SqlConnection(DataType);
SqlCommand UpdateCmd = new SqlCommand(updateSQL, Conn);
int Added = 0;
try
{
Conn.Open();
Added = UpdateCmd.ExecuteNonQuery();
if (Added > 0)
{
Response.Write("<script>alert('更改成功！');location.href='Default.asp编程x';</script>");
}
else
{
Response.Write("<script>alert('出现错误！更改失败！');history.back(-1);</script>");
}
}
catch (Exception err)
{
lblMessage.Text = err.Message;
}
finally
{
Conn.Close();
}
}
}拷贝内容到剪贴板
源代码:
<body>
<form id="form1" runat="server">
<div>
<asp编程:FormView ID="FormView1" runat="server">
<ItemTemplate>
<table style="width: 569px">
<tr>
<td style="width: 100px">
</td>
<td style="width: 100px">
更改名字</td>
</tr>
<tr>
<td style="width: 100px">
域名：</td>
<td style="width: 100px">
<asp编程:TextBox ID="DomainName" runat="server" Text='<%# Bind("DomainName") %>'></asp编程:TextBox>
<asp编程:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" ControlToValidate="DomainName"
Display="Dynamic" ErrorMessage="*"></asp编程:RequiredFieldValidator></td>
</tr>
<tr>
<td style="width: 100px">
</td>
<td style="width: 100px">
<asp编程:Button ID="btnAdd" runat="server" Text="提交" OnClick="btnAdd_Click"/><input id="Reset1" type="reset" value="重 填" /></td>
</tr>
</table>
</ItemTemplate>
</asp编程:FormView>
<asp编程
abel ID="lblMessage" runat="server"></asp编程abel></div>
</form>
源代码:
PageRankotected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
string DataType = " server=localhost;Initial Catalog=Domain;user id=sa;password=123456 ";
string selectSQL = " Select * From DomainList Where ID=" + Request.QueryString["ID"] + " ";
SqlConnection Conn = new SqlConnection(DataType);
SqlCommand selectCmd = new SqlCommand(selectSQL, Conn);
try
{
Conn.Open();
FormView1.DataSource = selectCmd.ExecuteReader();
FormView1.DataBind();
}
catch (Exception err)
{
lblMessage.Text = err.Message;
}
finally
{
Conn.Close();
}
}
}
PageRankotected void btnAdd_Click(object sender, EventArgs e)
{
string DataType = " server=localhost;Initial Catalog=Domain;user id=sa;password=123456 ";
string updateSQL = " update DomainList set DomainName='" + DomainName.Text + "',EditDate='" + DateTime.Now.ToShortDateString() + "' Where ID='" + Request.QueryString["ID"] + "' ";
SqlConnection Conn = new SqlConnection(DataType);
SqlCommand UpdateCmd = new SqlCommand(updateSQL, Conn);
int Added = 0;
try
{
Conn.Open();
Added = UpdateCmd.ExecuteNonQuery();
if (Added > 0)
{
Response.Write("<script>alert('更改成功！');location.href='Default.asp编程x';</script>");
}
else
{
Response.Write("<script>alert('出现错误！更改失败！');history.back(-1);</script>");
}
}
catch (Exception err)
{
lblMessage.Text = err.Message;
}
finally
{
Conn.Close();
}
}
}拷贝内容到剪贴板
源代码:
<body>
<form id="form1" runat="server">
<div>
<asp编程:FormView ID="FormView1" runat="server">
<ItemTemplate>
<table style="width: 569px">
<tr>
<td style="width: 100px">
</td>
<td style="width: 100px">
更改名字</td>
</tr>
<tr>
<td style="width: 100px">
域名：</td>
<td style="width: 100px">
<asp编程:TextBox ID="DomainName" runat="server" Text='<%# Bind("DomainName") %>'></asp编程:TextBox>
<asp编程:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" ControlToValidate="DomainName"
Display="Dynamic" ErrorMessage="*"></asp编程:RequiredFieldValidator></td>
</tr>
<tr>
<td style="width: 100px">
</td>
<td style="width: 100px">
<asp编程:Button ID="btnAdd" runat="server" Text="提交" OnClick="btnAdd_Click"/><input id="Reset1" type="reset" value="重 填" /></td>
</tr>
</table>
</ItemTemplate>
</asp编程:FormView>
<asp编程
abel ID="lblMessage" runat="server"></asp编程abel></div></form>
问题已经解决了！
应该DomainName是在模子列里，那么就要用FindControl(“DomainName”)找到
控件后再取值。
应该DomainName是在模子列里，那么就要用FindControl(“DomainName”)找到
控件后再取值。
Select * From DomainList里面肯定没有DomainName这一列。你把你的sql 语句拿到数据库中去执行一下，看看结果中有没有DomainName这一列。
还有，不能拼接sql，改用SqlParameter。
另：
to 帅青蛙:
绑定数据也可以用Bind的
还有，不能拼接sql，改用SqlParameter。
另：
to 帅青蛙:
绑定数据也可以用Bind的
Data-binding exPageRankessions are contained within <%# and %> delimiters and use the Eval and Bind functions. The Eval function is used to define one-way (read-only) binding. The Bind function is used for two-way (updatable) binding. In addition to calling Eval and Bind methods to perform data binding in a data-binding exPageRankession, you can call any publicly scoped code within the <%# and %> delimiters to execute that code and return a value during page PageRankocessing.
Data-binding exPageRankessions are resolved when the DataBind method of a control or of the Page class is called. For controls such as the GridView, DetailsView, and FormView controls, data-binding exPageRankessions are resolved automatically during the control's PreRender event and you are not required to call the DataBind method explicitly........
Data-binding exPageRankessions are resolved when the DataBind method of a control or of the Page class is called. For controls such as the GridView, DetailsView, and FormView controls, data-binding exPageRankessions are resolved automatically during the control's PreRender event and you are not required to call the DataBind method explicitly........
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