我正在开发一个简单的Intranet建议箱系统，让员工能够通过它提交他们的想法。现在，对于系统管理员，我列出所有提交的建议，并显示员工姓名，用户名，部门，建议标题，建议说明，并添加一列显示状态。对于Status列，它将显示一个DropDownList，其中包含可能的选项，如Accepted，Rejected ...等
这里我有以下问题;当管理员选择其中一个状态时，它将被更改，但刷新页面后，DropDownList将再次显示“选择”选项。我想要的是不断显示所选值而不是选择选项。
我的ASP.NET：
<asp:GridView ID="GridView1" runat="server" AllowPaging="True"
AllowSorting="True" AutoGenerateColumns="False" DataKeyNames="ID"
width="950px" CssClass="mGrid"
AlternatingRowStyle-CssClass="alt"
RowStyle-HorizontalAlign="Center"
DataSourceID="SqlDataSource1"
OnRowDataBound="GridView1_RowDataBound" >
<AlternatingRowStyle BackColor="White" ForeColor="#284775" />
<HeaderStyle Font-Bold = "true" ForeColor="Black" Height="20px"/>
<Columns>
<asp:BoundField DataField="ID" HeaderText="ID" InsertVisible="False"
ReadOnly="True" SortExpression="ID" />
<asp:BoundField DataField="Title" HeaderText="Title" SortExpression="Title" />
<asp:BoundField DataField="Description" HeaderText="Description"
SortExpression="Description" />
<asp:BoundField DataField="Name" HeaderText="Name" SortExpression="Name" />
<asp:BoundField DataField="Username" HeaderText="Username"
SortExpression="Username" />
<asp:BoundField DataField="DivisionShortcut" HeaderText="Division"
SortExpression="DivisionShortcut" />
<asp:TemplateField HeaderText="Status">
<ItemTemplate>
<asp:DropDownList ID="DropDownList" runat="server" DataSourceID="SqlDataSource2"
Font-Bold="True" ForeColor="#006666" AppendDataBoundItems="false"
DataTextField="Status" DataValueField="ID" AutoPostBack="true"
OnDataBound="DropDownList_DataBound" OnSelectedIndexChanged ="DropDownList_SelectedIndexChanged">
</asp:DropDownList>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
<asp:SqlDataSource ID="SqlDataSource1" runat="server"
ConnectionString="<%$ ConnectionStrings:testConnectionString %>"
SelectCommand="SELECT dbo.SafetySuggestionsLog.ID, dbo.SafetySuggestionsLog.Title, dbo.SafetySuggestionsLog.Description, dbo.employee.Name, dbo.SafetySuggestionsLog.Username,
dbo.Divisions.DivisionShortcut
FROM dbo.employee INNER JOIN
dbo.SafetySuggestionsLog ON dbo.employee.Username = dbo.SafetySuggestionsLog.Username INNER JOIN
dbo.Divisions ON dbo.employee.DivisionCode = dbo.Divisions.SapCode"
FilterExpression="[DivisionShortcut] like '{0}%'">
<FilterParameters>
<asp:ControlParameter ControlID="ddlDivision" Name="DivisionShortcut"
PropertyName="SelectedValue" Type="String" />
</FilterParameters>
</asp:SqlDataSource>
<%--For the DropDownList--%>
<asp:SqlDataSource ID="SqlDataSource2" runat="server"
ConnectionString="<%$ ConnectionStrings:testConnectionString %>"
SelectCommand="SELECT * FROM [SafetySuggestionsStatus]">
</asp:SqlDataSource>
的更新： 的
我的守则 - 背后：
protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
e.Row.Cells[0].Text = i.ToString();
i++;
DataTable dt = new DataTable();
DropDownList ddStatus = (DropDownList)e.Row.Cells[6].FindControl("DropDownList");
ddStatus.DataTextField = "Status";
ddStatus.DataValueField = "ID";
ddStatus.DataSource = dt;//this datatable should be filled with all the possible values for the status
ddStatus.DataBind();
}
}
DataTable GetStatusTable()
{
SqlDataAdapter da = new SqlDataAdapter("SELECT * FROM [SafetySuggestionsStatus]", "Data Source=localhost\\sqlexpress;Initial Catalog=psspdbTest;Integrated Security=True");
DataTable dt = new DataTable();
da.Fill(dt);
return dt;
}
protected void DropDownList_DataBound(object sender, EventArgs e)
{
if (!IsPostBack)
{
((DropDownList)sender).Items.Insert(0, new ListItem("--Select--", ""));
}
}
protected void DropDownList_SelectedIndexChanged(object sender, EventArgs e)
{
DropDownList ddl = (DropDownList)sender;
int suggestionStatus = int.Parse(ddl.SelectedValue);
GridViewRow row = (GridViewRow)ddl.NamingContainer;
string strID = GridView1.DataKeys[row.RowIndex]["ID"].ToString();
int ID = Int32.Parse(strID);
//For inserting the status in the database
string connString = "Data Source=localhost\\sqlexpress;Initial Catalog=psspdbTest;Integrated Security=True";
string updateCommand = "UPDATE SafetySuggestionsLog SET [StatusID] = @StatusID WHERE [ID] = @ID";
using (SqlConnection conn = new SqlConnection(connString))
{
conn.Open();
using (SqlCommand cmd = new SqlCommand(updateCommand, conn))
{
cmd.Parameters.Clear();
cmd.Parameters.AddWithValue("@StatusID", suggestionStatus);
cmd.Parameters.AddWithValue("@ID", ID);
cmd.ExecuteNonQuery();
}
conn.Close();
}
}
**那么如何解决这个问题让我们一直显示提交的建议的状态？
答案 0 :(得分：1)
为该字段尝试以下代码。更改为SelectedValue ='＆lt;％＃Bind（“StatusColumnName”）％＆gt;'
<asp:TemplateField HeaderText="Status">
<ItemTemplate>
<asp:DropDownList ID="DropDownList" runat="server"
Font-Bold="True" ForeColor="#006666" AppendDataBoundItems="false"
AutoPostBack="true"
OnDataBound="DropDownList_DataBound" OnSelectedIndexChanged ="DropDownList_SelectedIndexChanged" SelectedValue='<%# Bind("StatusColumnName") %>'>
</asp:DropDownList>
</ItemTemplate>
</asp:TemplateField>
现在添加以下代码
protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow) //skip header row
{
DataTable dt= GetStatusTable();
DropDownList ddStatus= (DropDownList)e.Row.Cells[5].FindControl("DropDownList");
ddStatus.DataTextField="Status";
ddStatus.DataValueField="ID" ;
ddStatus.DataSource=dt;//this datatable should be filled with all the possible values for the status
ddStatus.DataBind();
}
}
DataTable GetStatusTable()
{
SqlDataAdapter da= new SqlDataAdapter("select Status,ID from Status","connectionstring here");
DataTable dt= new DataTable();
da.Fill(dt);
return dt;
}
答案 1 :(得分：0)
<asp:TemplateField HeaderText="Status">
<ItemTemplate>
<asp:DropDownList ID="DropDownList" runat="server"
Font-Bold="True" ForeColor="#006666" AppendDataBoundItems="false"
AutoPostBack="true"
OnSelectedIndexChanged ="DropDownList_SelectedIndexChanged" DataSource="<%#WriteFunctionNameHereWhichtoBindDropDownList%>" </asp:DropDownList>
现在，当网格绑定时，下拉列表将被绑定。 现在在GridViewItemDataBound事件
找到DropDownList控件并将SelectedValue设置为来自数据库。永远不要忘记在来自数据库的gridview隐藏字段中绑定值。找到隐藏的字段和下拉列表。
现在我认为你可以做到这一点。