C# 如何根据第一个GridViewComboxColumn的选择填充第二列_C#_Winforms_C# 4.0_Datagridview_Datagridviewcombobox

C# 如何根据第一个GridViewComboxColumn的选择填充第二列

c# winforms c#-4.0

C# 如何根据第一个GridViewComboxColumn的选择填充第二列,c#,winforms,c#-4.0,datagridview,datagridviewcombobox,C#,Winforms,C# 4.0,Datagridview,Datagridviewcombobox,我有两个DataGridViewComboxColumn。我想根据第一个GridViewComboBoxColumn的选择填充第二列。我在第一个Combobox中有组，在第二个ComboxColumn中有服务。我希望当我选择group1时，只有group1的服务显示在服务组合框中。我正在使用存储过程 var groupColumn = new DataGridViewComboBoxColumn(); DataTable dtcategori = cb.Get

我有两个DataGridViewComboxColumn。我想根据第一个GridViewComboBoxColumn的选择填充第二列。我在第一个Combobox中有组，在第二个ComboxColumn中有服务。我希望当我选择group1时，只有group1的服务显示在服务组合框中。我正在使用存储过程

var groupColumn = new DataGridViewComboBoxColumn();

                DataTable dtcategori = cb.GetAllDataCategori();
                groupColumn.Name = "Group";
                groupColumn.HeaderText = Resources.GroupName;
                groupColumn.DataSource = dtcategori;
                groupColumn.ValueMember = "ID";
                groupColumn.DisplayMember = "Name";
                groupColumn.Width = 100;
                this.DataGridViewFactor.Columns.Add(groupColumn);

                var serviceColumn = new DataGridViewComboBoxColumn();
                    //var categoriId = Convert.ToInt32(groupColumn.);
                // DataTable dtServices = sb.ServiceGetById(categoriId);
                    DataTable dtServices = sb.GetAllDataServices();
                    serviceColumn.Name = "Services";
                    serviceColumn.HeaderText = Resources.Service;
                    serviceColumn.DataSource = dtServices;
                    serviceColumn.ValueMember = "ID";
                    serviceColumn.DisplayMember = "Name";
                    serviceColumn.Width = 100;

                    this.DataGridViewFactor.Columns.Add(serviceColumn);

哇，我花了大约2个小时才找到这个答案，虽然不是很好，但很有用：）

首先，您必须将

groupColumn.DataSource

更改为

BindingSource

而不是代码中的

DataTable

，因为当您从

groupColumn

中的组合框中选择项目时，需要一些

PositionChanged

事件来通知。您知道，

DataGridViewColumn

没有任何

SelectedIndexChanged

事件。其次，我看不到您的

组

和

服务

之间有任何关系，

服务

的数据源应该有一个类似

组ID

的字段，以便您可以在两列之间链接。我想有这样一个

GroupID

字段。您的

Services

有一个

ID

，但我不确定它是否是

GroupID

，它可能是您的

ServiceID

推荐：我认为您应该将

groupColumn的

和

serviceColumn的

DisplayStyle

更改为

DataGridViewComboBoxDisplayStyle。没有任何内容

-我觉得最合适

我想在代码旁边的注释中解释我的解决方案。代码如下：

//Your code is modified a little.
var groupColumn = new DataGridViewComboBoxColumn();
groupColumn.DisplayStyle = DataGridViewComboBoxDisplayStyle.Nothing;
DataTable dtcategori = cb.GetAllDataCategori();
groupColumn.Name = "Group";
groupColumn.HeaderText = Resources.GroupName;
//Create a BindingSource from your DataTable
BindingSource bs = new BindingSource(dtcategori,"");
groupColumn.DataSource = bs;
bs.PositionChanged += (s,e) => {
   //Filter for items which have the selected GroupID
   ((DataTable)((DataGridViewComboBoxColumn)DataGridViewFactor.Columns["Services"]).DataSource).DefaultView.RowFilter =
                string.Format("GroupID='{0}'",((DataRowView)bs.Current).Row["ID"]);
   //Set the initial value of the corresponding cell in serviceColumn
   DataGridViewFactor.CurrentRow.Cells["Services"].Value = ((DataTable)((DataGridViewComboBoxColumn)DataGridViewFactor.Columns["Services"]).DataSource).DefaultView.ToTable().Rows[0]["Name"];
};
//-------------------------------------------
groupColumn.ValueMember = "ID";
groupColumn.DisplayMember = "Name";
groupColumn.Width = 100;
this.DataGridViewFactor.Columns.Add(groupColumn);

var serviceColumn = new DataGridViewComboBoxColumn();
serviceColumn.DisplayStyle = DataGridViewComboBoxDisplayStyle.Nothing;
//var categoriId = Convert.ToInt32(groupColumn.);
// DataTable dtServices = sb.ServiceGetById(categoriId);
DataTable dtServices = sb.GetAllDataServices();
serviceColumn.Name = "Services";
serviceColumn.HeaderText = Resources.Service;
serviceColumn.DataSource = dtServices;
serviceColumn.ValueMember = "ID";
serviceColumn.DisplayMember = "Name";
serviceColumn.Width = 100;

this.DataGridViewFactor.Columns.Add(serviceColumn);

//Because filtering this way can make some cell have a value which is not contained in 
//the DataGridViewComboBoxColumn.Items, we have to handle the DataError
private void DataGridViewFactor_DataError(object sender, DataGridViewDataErrorEventArgs e){
    //We're interested only in DataGridViewComboBoxColumn
    if(DataGridViewFactor.Columns[e.ColumnIndex] is DataGridViewComboBoxColumn){
        e.Cancel = true;
    }
}
//Because when you filter on a row, the DataGridViewComboBoxColumn.DataSource with
//the filtered DefaultView will apply on all the rows in the same 
//DataGridViewComboBoxColumn, we have to apply the filter for each row if it is selected
private void DataGridViewFactor_SelectionChanged(object sender, EventArgs e)
{            
        ((DataTable)((DataGridViewComboBoxColumn)DataGridViewFactor.Columns["Services"]).DataSource).DefaultView.RowFilter =
           string.Format("GroupID='{0}'", DataGridViewFactor.CurrentRow.Cells["Group"].Value);            
}
//Because when you filter on a row, the DataSource DefaultView of the groupColumn will
//be changed (limited to fewer items) and there will be cells in that column having 
//values which are not contained in the filtered items. Those cells will not be 
//displayed when you move the mouse over. This CellPainting event handler is to help 
//them look normal.
private void DataGridViewFactor_CellPainting(object sender, DataGridViewCellPaintingEventArgs e){
    if (e.RowIndex > -1 && e.ColumnIndex > -1)
    {
            if (e.Value != null)
            {
                e.Handled = true;
                e.PaintBackground(e.CellBounds, true);
                StringFormat sf = new StringFormat() { LineAlignment = StringAlignment.Center };
                e.Graphics.DrawString(e.Value.ToString(), DataGridViewFactor.Font, new SolidBrush(DataGridViewFactor.ForeColor), e.CellBounds, sf);
            }
    }
}

就这些

我希望它能帮助你