在运行时从 DataGridView 更改列

Question

这可能很容易，但我无法在任何地方找到答案。我正在使用 DataTable 在 ASP.NET Web 窗体上动态填充先前创建的 DataGridView，但我想更改出现在该 DataGridView 上的列的名称，但我根本不知道我做错了什么.下面是代码：

DataTable dtUsuarios = DBManager.RunSqlGetDataTable(
  @"select b.UserName, c.Email, c.IsLockedOut, c.LastLoginDate, 
      case 
        when e.RoleName is not null then 1
        else 0 end Admin
    from dbo.aspnet_Applications a join dbo.aspnet_Users b
      on a.ApplicationId = b.ApplicationId
    join dbo.aspnet_Membership c
      on b.ApplicationId = c.ApplicationId
      and b.UserId = c.UserId
    left join dbo.aspnet_UsersInRoles d
      on d.UserId = b.UserId
    left join dbo.aspnet_Roles e
      on d.RoleId = e.RoleId
    where a.ApplicationName = 'Mont Blanc Catalogo'");
dtUsuarios.Columns["UserName"].Caption = "Nome Usuário";
dtUsuarios.Columns["Email"].Caption = "E-mail";
dtUsuarios.Columns["IsLockedOut"].Caption = "Bloqueado";
dtUsuarios.Columns["LastLoginDate"].Caption = "Último Login";
dtUsuarios.Columns["Admin"].Caption = "Administrador";
DataView dvUsuarios = new DataView(dtUsuarios) { Sort = "UserName" };
gdvUsuarios.DataSource = dvUsuarios;
gdvUsuarios.DataBind();
//gdvUsuarios.Columns[0].HeaderText = "Nome Usuário";
//gdvUsuarios.Columns[1].HeaderText = "E-mail";
//gdvUsuarios.Columns[2].HeaderText = "Bloqueado";
//gdvUsuarios.Columns[3].HeaderText = "Último Login";
//gdvUsuarios.Columns[4].HeaderText = "Administrador";

设置值更改DataTable的标题不起作用，并且在DataBind之后，DataGridView的Columns.Count属性返回零列！执行代码后，我的asp页面上一切正常，但标题错误。我做错了什么？
提示

Answer 1

我以为我已经挖得够多了，但显然还不够。我在这里找到的答案： Any way to manipulate the columns in GridView with AutoGenerateColumns = true?

下面是生成的代码：

public partial class admin_CadUsuarios : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        DataTable dtUsuarios = DBManager.RunSqlGetDataTable(
          @"select b.UserName, c.Email, c.IsLockedOut, c.LastLoginDate, 
              case 
                when e.RoleName is not null then 1
                else 0 end Admin
            from dbo.aspnet_Applications a join dbo.aspnet_Users b
              on a.ApplicationId = b.ApplicationId
            join dbo.aspnet_Membership c
              on b.ApplicationId = c.ApplicationId
              and b.UserId = c.UserId
            left join dbo.aspnet_UsersInRoles d
              on d.UserId = b.UserId
            left join dbo.aspnet_Roles e
              on d.RoleId = e.RoleId
            where a.ApplicationName = 'Mont Blanc Catalogo'");
        DataView dvUsuarios = new DataView(dtUsuarios) { Sort = "UserName" };
        gdvUsuarios.DataSource = dvUsuarios;
        gdvUsuarios.DataBind();
    }

    protected void gdvUsuarios_RowDataBound(object sender, GridViewRowEventArgs e)
    {
        if (e.Row.RowType == DataControlRowType.Header)
        {
            e.Row.Cells[0].Text = "Nome Usuário";
            e.Row.Cells[1].Text = "E-mail";
            e.Row.Cells[2].Text = "Bloqueado";
            e.Row.Cells[3].Text = "Último Login";
            e.Row.Cells[4].Text = "Administrador";
        }
    }
}

RowDataBound 成功了。

Answer 2

您可以尝试列别名，当然这取决于您的特定 sql 应用程序/版本。

DataTable dtUsuarios = DBManager.RunSqlGetDataTable( 
@"select 
  b.UserName [Nome Usuário], 
  c.Email [E-mail], 
  c.IsLockedOut [Bloqueado], 
  c.LastLoginDate [Último Login],  
  case  
    when e.RoleName is not null then 1 
    else 0 end [Administrador] 
from dbo.aspnet_Applications a join dbo.aspnet_Users b 
  on a.ApplicationId = b.ApplicationId 
join dbo.aspnet_Membership c 
  on b.ApplicationId = c.ApplicationId 
  and b.UserId = c.UserId 
left join dbo.aspnet_UsersInRoles d 
  on d.UserId = b.UserId 
left join dbo.aspnet_Roles e 
  on d.RoleId = e.RoleId 
where a.ApplicationName = 'Mont Blanc Catalogo'"); 

DataView dvUsuarios = new DataView(dtUsuarios) { Sort = "[Nome Usuário]" }; 
gdvUsuarios.DataSource = dvUsuarios; 
gdvUsuarios.DataBind(); 

Answer 3

如果您想重命名 DataTable 中的列，只需执行（ColumnName 而不是 Caption）：

dtUsuarios.Columns["UserName"].ColumnName= "Nome Usuário"

如果您想更改向用户显示的输出，您可能希望在标记中执行此操作。如果是 GridView，请在 BoundColumn 上指定 HeaderText