C# 使用C从sql数据库中的Dropdownlist更新表中选择值#

我将Dropdownlist放在GridView1中，Dropdownlist的值为0和1。我想要的是：根据从dropDownlist中选择的值，在我的sql数据库中用该值更新列[Status]

protected void SQL_Update(object sender, GridViewUpdateEventArgs e){

SqlConnection conn = new SqlConnection();
conn.ConnectionString = @"Data Source=.\SQLEXPRESS;Initial Catalog=Korisnik;Integrated Security=True";
SqlCommand cmd = new SqlCommand();
cmd.CommandText = "UPDATE RegistracijaKorisnik SET Status = " + ((DropDownList)GridView1.Rows[e.RowIndex].FindControl("DropDownList2")).SelectedValue; ;
cmd.Connection = conn;

conn.Open();
cmd.ExecuteNonQuery();

conn.Close();}

---

如果我是你，从你提供的信息来看，我认为解决办法是

<asp:TemplateField />

这将触发GridView的编辑事件，用于标识正在编辑和设置的行的索引

GridView1.EditIndex = e.NewEditIndex

现在，在该行中，您将拥有值为0和1的DropDownList。您还需要在EditTemplate中有一个按钮，用于保存更改

CommandName="Update"

然后处理网格的RowUpdate事件，以在触发RowUpdate时从DropdownList中查找新值，使用此新数据更新数据库中的相关行，然后将GridView的EditIndex属性设置回“-1”以停止编辑该行。然后需要在GridView中重新绑定数据以显示更改

一个小例子可以是：

<asp:TemplateField HeaderText="Edit">
    <ItemTemplate>
        <asp:Button ID="EditImageButton" runat="server" Text="Edit" CommandName="Edit"' />
    </ItemTemplate>
    <EditItemTemplate>
        <asp:Button ID="UpdateButton" runat="server" ToolTip="Save" CommandName="Update"/>
    </EditItemTemplate>
</asp:TemplateField>
<asp:TemplateField>
    <ItemTemplate>
        <% #Eval("Status")%>
    </ItemTemplate>
    <EditTemplate>
        <asp:DropdownList ID="List" runat="server" />
    <EdiTemplate>
</asp:TemplateField>


protected void GridView1_RowEditing(object sender, GridViewEditEventArgs e)
{
        GridView1.EditIndex = e.NewEditIndex;
        GridView1.DataSource = Session["domainData"];
        GridView1.DataBind();
}

protected void GridView1_RowUpdating(object sender, GridViewUpdateEventArgs e)
{
    int index = GridView1.EditIndex;
    int key = Convert.ToInt32(GridView.DataKeys[index].Value);
    GridViewRow row = GridView1.Rows[index];
    DropdownList = row.FindControl("List") as DropDownList;

    // Save changes to database

    // GridView1.EditIndex = -1;
    // Rebind grid data
}

假设您拥有DropDownList并以任何方式绑定它：

<asp:GridView ID="Grid" runat="server" OnRowUpdating="SQL_Update">
  <asp:TemplateField> 
    <EditItemTemplate>
      <asp:Button ID="Btn" runat="server" CommandName="Update" Text="Update" />
    </EditItemTemplate>
  </asp:TemplateField> 
  <asp:TemplateField>
    <EditItemTemplate>
      <asp:DropDownList ID="ddl" runat="server" /> 
    </EditItemTemplate> 
  </asp:TemplateField> 
</asp:GridView>

你说“里面”是什么意思？在“状态”列的编辑模板内？在“项目模板”中“确定”。我写这个。现在如何调用SQL\u更新？我还需要在DropDownList2\u SelectedIndexChanged或Page\u load中写些什么？编辑了我的答案。请注意，GridView中有一个“OnRowUpdating”部分。该按钮有一个命令名“Update”，它将触发相应的事件。在SelectedIndexChanged或Page_Load中应该不需要写入任何内容，除非在调用update命令之前需要对DropDownList进行修改。我不知道哪里出错，但当我从DropDownList中选择值时，不要更新表。：/当我从dropdownlist中选择值来更新表中的值（列状态）时，不需要我按钮。我编辑我的帖子，你能告诉我在SQL_更新中哪里出错吗？还要记住，更新数据库后，要显示更改，你必须重新绑定gridview，使用最初用于绑定gridview的方法
<asp:TemplateField HeaderText="Edit">
    <ItemTemplate>
        <asp:Button ID="EditImageButton" runat="server" Text="Edit" CommandName="Edit"' />
    </ItemTemplate>
    <EditItemTemplate>
        <asp:Button ID="UpdateButton" runat="server" ToolTip="Save" CommandName="Update"/>
    </EditItemTemplate>
</asp:TemplateField>
<asp:TemplateField>
    <ItemTemplate>
        <% #Eval("Status")%>
    </ItemTemplate>
    <EditTemplate>
        <asp:DropdownList ID="List" runat="server" />
    <EdiTemplate>
</asp:TemplateField>


protected void GridView1_RowEditing(object sender, GridViewEditEventArgs e)
{
        GridView1.EditIndex = e.NewEditIndex;
        GridView1.DataSource = Session["domainData"];
        GridView1.DataBind();
}

protected void GridView1_RowUpdating(object sender, GridViewUpdateEventArgs e)
{
    int index = GridView1.EditIndex;
    int key = Convert.ToInt32(GridView.DataKeys[index].Value);
    GridViewRow row = GridView1.Rows[index];
    DropdownList = row.FindControl("List") as DropDownList;

    // Save changes to database

    // GridView1.EditIndex = -1;
    // Rebind grid data
}

<asp:GridView ID="Grid" runat="server" OnRowUpdating="SQL_Update">
  <asp:TemplateField> 
    <EditItemTemplate>
      <asp:Button ID="Btn" runat="server" CommandName="Update" Text="Update" />
    </EditItemTemplate>
  </asp:TemplateField> 
  <asp:TemplateField>
    <EditItemTemplate>
      <asp:DropDownList ID="ddl" runat="server" /> 
    </EditItemTemplate> 
  </asp:TemplateField> 
</asp:GridView>

protected void SQL_Update(object sender, GridViewUpdateEventArgs e)
{
   /*
     You'll have to find the control in the GridView, using FindControl, and cast it to a DropDownList  
     Using ddl.SelectedValue isn't going to work
   */
   string sql = "Update table set Status = " + ((DropDownList)Grid.Rows[e.RowIndex].FindControl("ddl")).SelectedValue 
   //Other SQL logic here

   //Commit the database changes, using whichever SQL driver you have.
}