在DataGridView中设置所有列运行时的默认值 [英] Set default value of all columns runtime in DataGridView

问题描述

我在datagridview上添加了n个列数。列数不固定，列名也固定。我也想为每行中的所有列添加deault值，例如

I am adding n Numbers of columns on a datagridview. The number of columns is not fixed and also the name of column is fixed. Also i want to add deault value for all columns in every rows like

这些列也在运行时添加，并且gird的数据源也与类相关联

Also these columns are added on runtime and datasource of gird is also associate with a class

       DbDataEntities db = new DbDataEntities();


var MasterAttendanceTypesDetail = db.MasterAttendanceTypes.ToList();
            foreach (string AttendanceType in MasterAttendanceTypesDetail.Select(s => s.AttendanceTypeName).ToList())
            {
                if (!dgv1.Columns.Contains(AttendanceType))
                {
                    DataGridViewColumn dgchkCol = new DataGridViewColumn();
                    dgchkCol.Name = AttendanceType;
                    dgv1.Columns.Add(dgchkCol);
                }
            }

网格中添加的列数取决于表格中的条目几乎是100。

因此如何设置每列的默认值。

Number of columns added in grid is depend on number of entries in tabel at it is almost 100.
thus how could i set default value of each column.

推荐答案

您可以继承DataGridViewColumn和DataGridViewCell并覆盖 DefaultNewRowValue 属性。

You can inherit the DataGridViewColumn and DataGridViewCell and override the DefaultNewRowValue property.

public class ExtendedColumn : DataGridViewColumn
{
    public ExtendedColumn()
        : base(new ExtendedCell())
    {
    }
}

public class ExtendedCell : DataGridViewTextBoxCell
{
    public ExtendedCell()
        : base()
    {
    }

    public override object DefaultNewRowValue
    {
        get
        {
            return "aaa";
        }
    }
}

并在您的代码中使用像这样：

And use it in your code like this:

ExtendedColumn col = new ExtendedColumn();
col.Name = AttendanceType;
dgv1.Columns.Add(col);

此处是指向MSDN的链接，该链接演示了DefaultNewRowValue的使用：

Here is a link to MSDN that demonstrates the use of DefaultNewRowValue:

http://msdn.microsoft.com/zh-cn/library/system.windows.forms.datagridviewcell.defaultnewrowvalue（v = vs.110）.aspx

但是由于您可以有许多需要默认值的列，因此您可以处理 DefaultValuesNeeded 事件。

But since you can have many columns for which default value is required, you can handle DefaultValuesNeeded event.

dataGridView1.DefaultValuesNeeded +=new DataGridViewRowEventHandler(dataGridView1_DefaultValuesNeeded);

private void dataGridView1_DefaultValuesNeeded(object sender,
System.Windows.Forms.DataGridViewRowEventArgs e)
    {
        e.Row.Cells[0].Value = "aaa";
        e.Row.Cells[1].Value = "bbb";
        e.Row.Cells[2].Value = "ccc";

    }

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