Question

我试图隐藏“Key”或[0]列。我还试图在下面的代码中设置复选框，最终用户可以单击/取消选中。默认情况下，我将复选框设置为未选中状态。

此代码dgvPunchs.Columns[0].Hidden = true;是我如何隐藏列的方法，但它出错并出现以下错误。

“对象引用未设置为对象的实例。”

目前也显示复选框，但最终用户无法单击它们。我很困惑。请帮忙！：）

protected void GenerateSalaryPunchesTable()
        {
            this.dgvPunchs.Rows.Clear();

            string[] DateRange = this.cboPayPeriods.SelectedItem.Text.ToString().Replace(" ", "").Split('-');

            DataTable pDates = new DataTable();

            pDates.Columns.Add("Key");
            pDates.Columns.Add("Date", System.Type.GetType("System.DateTime")); // Date Cell
            pDates.Columns.Add("Worked", System.Type.GetType("System.Boolean")); //Worked CB
            pDates.Columns.Add("Vaction", System.Type.GetType("System.Boolean")); //Vacation CB
            pDates.Columns.Add("Sick", System.Type.GetType("System.Boolean")); //Sick CB
            pDates.Columns.Add("Holiday", System.Type.GetType("System.Boolean")); //Holiday CB
            pDates.Columns.Add("Error", System.Type.GetType("System.String")); //Error

            foreach (DataColumn col in pDates.Columns)
            {
                col.ReadOnly = false;
            }

            pDates.Columns["Key"].ColumnMapping = MappingType.Hidden;

            while (Convert.ToDateTime(DateRange[0]) <= Convert.ToDateTime(DateRange[1]))
            {
                if (Convert.ToDateTime(DateRange[0]).DayOfWeek != DayOfWeek.Saturday & Convert.ToDateTime(DateRange[0]).DayOfWeek != DayOfWeek.Sunday)
                {

                    DataRow nRow = pDates.NewRow();
                    nRow["Key"] = Convert.ToDateTime(DateRange[0].ToString()).ToShortDateString();
                    nRow["Date"]= Convert.ToDateTime(DateRange[0].ToString()).ToShortDateString();
                    nRow["Worked"] = 0;
                    nRow["Vaction"] = 0;
                    nRow["Sick"] = 0;
                    nRow["Holiday"] = 0;
                    nRow["Error"] = "";

                    pDates.Rows.Add(nRow);

                }

                DateRange[0] = Convert.ToDateTime(DateRange[0]).AddDays(1).ToShortDateString();
            }


            dgvPunchs.DataSource = pDates;
            dgvPunchs.DataBind();
            dgvPunchs.Columns[0].Hidden = true;
        }

Answer 1

您需要在WebDataGrid中手动创建列，如果您不想，只需检查columns.count，它将是= 0。因此，您可以在WebDataGrid的init事件中执行此操作（在设置WebDataGrid1.datasource并使WebDataGrid1.autogenertecolumns = false之前）：

Infragistics.Web.UI.GridControls.BoundDataField f;    
Infragistics.Web.UI.GridControls.EditingColumnSetting columnSettingReadOnly;

foreach (System.Data.DataColumn c in pDates.Columns)
            {
                    f = new Infragistics.Web.UI.GridControls.BoundDataField(true);
                    f.DataFieldName = c.ColumnName;
                    f.Key = c.ColumnName;
                    f.Header.Text = c.ColumnName;
                    WebDataGrid1.Columns.Add(f);
// In order to set it as readonly:
columnSettingReadOnly = New Infragistics.Web.UI.GridControls.EditingColumnSetting();
                columnSettingReadOnly.ColumnKey = f.Key;
                columnSettingReadOnly.ReadOnly = True;
                WebDataGrid1.Behaviors.EditingCore.Behaviors.CellEditing.ColumnSettings.Add(columnSettingReadOnly);
            }

请尝试以上操作并告诉我们。

PS：不确定列显示复选框的问题是否允许您检查...

Answer 2

我必须将所有列的标记添加到html端。关闭AutoGenerateColumns，我打开了EnableAjaxViewState和EnableDataViewState，不确定是否需要它们。但是，通过将其添加到HTML，我就可以调用代码

ig：WebDataGrid ID =“dgvPunchs”runat =“server”Width =“800px” DataKeyFields =“Key”AutoGenerateColumns =“False”EnableAjaxViewState =“True”EnableDataViewState =“True”＆gt;

<Columns>
    <ig:BoundDataField DataFieldName="Key" Key="Key">
        <Header Text="Key" />
    </ig:BoundDataField>
    <ig:BoundDataField DataFieldName="Date" Key="Date">
        <Header Text="Date" />
    </ig:BoundDataField>
    <ig:BoundCheckBoxField DataFieldName="Worked" 
        Key="Worked">
        <Header Text="Worked" />
    </ig:BoundCheckBoxField>
    <ig:BoundCheckBoxField DataFieldName="Vaction" 
        Key="Vaction">
        <Header Text="Vaction" />
    </ig:BoundCheckBoxField>
    <ig:BoundCheckBoxField DataFieldName="Sick" 
        Key="Sick">
        <Header Text="Sick" />
    </ig:BoundCheckBoxField>
    <ig:BoundCheckBoxField DataFieldName="Holiday" 
        Key="Holiday">
        <Header Text="Holiday" />
    </ig:BoundCheckBoxField>
    <ig:BoundDataField DataFieldName="Error" Key="Error">
        <Header Text="Error" />
    </ig:BoundDataField>
</Columns>

<Behaviors>
    <ig:EditingCore>
        <Behaviors>
            <ig:CellEditing>
            </ig:CellEditing>
        </Behaviors>
    </ig:EditingCore>
</Behaviors>

dgvPunchs.DataSource = pDates;
dgvPunchs.DataBind();
dgvPunchs.Columns[0].Hidden = true;

Infragistics WebDataGrid复选框和隐藏列问题

2 个答案: