c#中DataGridViewComboBoxColumn如何实现点击右侧按钮显示下拉选项

Question

如题，DataGridViewComboBoxColumn的按钮点击后，不能出现下拉选项，而是先确定焦点，再次点击按钮才会出现下拉选项；我想实现像comboBox一样的功能，点击combobox的按钮，就会显示下拉选项

Answer 1

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 DataGridView内包含ComboBox列 实现选定ComboBox的项数据的联动.     
首先要绑定 ComboBox 然后绑定DataGridView                          DataSet dsProp = new DataSet();
             DataSet dsCond = new DataSet();
             DataSet dsCond1 = new DataSet();
             DataSet dsCond2 = new DataSet();
            try
            ...{
                dsProp = App.DbService.GetStandardControlProp(intPrjCode, intStationId, intModuleId, intPointId);
                dsCond = App.DbService.GetStandardControlCond(intPrjCode,intStationId, intModuleId,1);
                dsCond1 = App.DbService.GetStandardControlCond(intPrjCode, intStationId, intModuleId, 2);
                dsCond2 = App.DbService.GetStandardControlCond(intPrjCode, intStationId, intModuleId, 3);
                dsStationInfo = App.DbService.getStationNameDs(intPrjCode);
                
            }
            catch (Exception ex)
            ...{
                MessageBox.Show(ex.Message, "Prompt", MessageBoxButtons.OK, MessageBoxIcon.Error);
                return;
            }
            if (dsProp == null || dsCond==null)
            ...{
                MessageBox.Show("数据加载失败！");
                return;
            }
                        
            DataRow drNew = dsStationInfo.Tables[0].NewRow();
            drNew["stationid"] = System.DBNull.Value;
            drNew["stationnm"] = System.DBNull.Value;
            dsStationInfo.Tables[0].Rows.InsertAt(drNew, 0);            StationID.DataSource = dsStationInfo.Tables[0];
            StationID.DisplayMember = "STATIONNM";
            StationID.ValueMember = "STATIONID";
            MODULEID.DataSource = dsCond.Tables[0];
            MODULEID.DisplayMember = "MODULEID";
            MODULEID.ValueMember = "MODULEID";
            POINTNM.DataSource = dsCond.Tables[0];
            POINTNM.DisplayMember = "POINTNAME";
            POINTNM.ValueMember = "POINTID";            StationID2.DataSource = dsStationInfo.Tables[0];
            StationID2.DisplayMember = "STATIONNM";
            StationID2.ValueMember = "STATIONID";
            MODULENM2.DataSource = dsCond1.Tables[0];
            MODULENM2.DisplayMember = "MODULEID";
            MODULENM2.ValueMember = "MODULEID";
            POINTNM2.DataSource = dsCond1.Tables[0];
            POINTNM2.DisplayMember = "POINTNAME";
            POINTNM2.ValueMember = "POINTID";            StationID3.DataSource = dsStationInfo.Tables[0];
            StationID3.DisplayMember = "STATIONNM";
            StationID3.ValueMember = "STATIONID";
            MODULENM3.DataSource = dsCond2.Tables[0];
            MODULENM3.DisplayMember = "MODULEID";
            MODULENM3.ValueMember = "MODULEID";
            POINTNM3.DataSource = dsCond2.Tables[0];
            POINTNM3.DisplayMember = "POINTNAME";
            POINTNM3.ValueMember = "POINTID";
            
            dgvList.DataSource = InitDT(dsCond.Tables[0].Copy(), 10, 0);
            dgvList2.DataSource = InitDT(dsCond1.Tables[0].Copy(), 7, 0);
            dgvList3.DataSource = InitDT(dsCond2.Tables[0].Copy(), 7, 1);注意设定ComboBox的属性:DataPropertyName ,然后调用CellValueChanged事件,此事件主要完成在选定ComboBox时重新绑定要改变的ComboBox. private void dgvList_CellValueChanged(object sender, DataGridViewCellEventArgs e)
        ...{
            dgvCellAutoSetValue(e, dgvList);
        }
  private void dgvCellAutoSetValue(DataGridViewCellEventArgs e, DataGridView dgv)
        ...{            if (e.ColumnIndex == 1)
            ...{
                if (e.RowIndex > -1)
                ...{
                    if (dgv.Rows[e.RowIndex].Cells[1].Value == System.DBNull.Value)
                    ...{
                        return;
                    }
                    DataGridViewComboBoxCell cell = (DataGridViewComboBoxCell)dgv.Rows[e.RowIndex].Cells[2];
                    try
                    ...{
                        DataTable DtModule = App.DbService.GetModuleIDInfo(intPrjCode, Convert.ToInt16(dgv.Rows[e.RowIndex].Cells[e.ColumnIndex].Value)).Tables[0];
                        if (DtModule.Rows.Count > 0)
                        ...{
                            cell.DataSource = DtModule;
                            
                            cell.DisplayMember = "MODULEID";
                            cell.ValueMember = "MODULEID";                            if (cell.Items.Count > 0)
                            ...{
                                cell.Value = ((DataRowView)cell.Items[0]).Row[cell.ValueMember];
                            }
                        }
                    }
                    catch (Exception ex)
                    ...{
                        MessageBox.Show(ex.Message);
                    }
                }
            }
            else if (e.ColumnIndex == 2)
            ...{
                if (e.RowIndex > -1)
                ...{
                    if (dgv.Rows[e.RowIndex].Cells[2].Value == System.DBNull.Value || dgv.Rows[e.RowIndex].Cells[1].Value==DBNull.Value)
                    ...{
                        return;
                    }
                    int stationid = Convert.ToInt16(dgv.Rows[e.RowIndex].Cells[1].Value);
                    int moduleid = Convert.ToInt16(dgv.Rows[e.RowIndex].Cells[2].Value);
                    DataGridViewComboBoxCell cell = (DataGridViewComboBoxCell)dgv.Rows[e.RowIndex].Cells[3];
                    try
                    ...{
                        DataTable DtPoint = App.DbService.GetPointInfo(intPrjCode, stationid, moduleid).Tables[0];
                        if (DtPoint.Rows.Count > 0)
                        ...{
                            cell.DataSource = DtPoint;
                            cell.DisplayMember = "POINTNAME";
                            cell.ValueMember = "POINTID";
                            if (cell.Items.Count > 0)
                            ...{
                                cell.Value = ((DataRowView)cell.Items[0]).Row[cell.ValueMember];
                            }
                        }
                    }
                    catch (Exception ex)
                    ...{
                        MessageBox.Show(ex.Message);
                    }
                }
            }
        }
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Answer 2

我已经解决了 可以发送F4信息（sender.sendKey("{F4}")）
f4可以像comboBox发送打开item的请求谢谢上面的回答

Answer 3

但sender好像没有sendkey这个方法吧

Answer 4

C#可以使用SendKeys.Send("{F4}"),我已经试过了，可以的