我已经完成了我常用的谷歌搜索，但我遇到的所有主题似乎都没有像我正在做的那样做，或者想以同样的方式做到这一点。我能找到的最接近的是
忽略这是VB并且我在C＃中工作，他们将数据集/源等设置在顶部并逐行创建新列，而我通过网格创建数据SQL查询。简而言之，我希望这样做：
我已经完成了所有工作并进行了设置，我遇到的问题是将其作为单个组合框，在逐行检查结束值时使用不同的值（下面的屏幕截图使其更易于理解）
http://i67.tinypic.com/1zdqafd.jpg
“exp grade”应该是基于ID列读取的值的不同值。我尝试了一些不同的方法让它成为一个不同等级的列，但我得到第一组或第二组（如果我离开if列不存在）或我得到多列（如果我删除它为id = 2起）。第一部分是使用查询检查每行ID列的值
foreach (DataGridViewRow rw in this.dgvDDL.Rows)
{
if (Convert.ToString(rw.Cells["ID"].Value) == "1")
{
if (!dgvDDL.Columns.Contains("Exp_Grade"))
{
try
{
DataGridViewComboBoxColumn cmbGrade = new DataGridViewComboBoxColumn();
SqlConnection conn = new SqlConnection(@"");
SqlCommand cmd = new SqlCommand("SELECT AREA_CODE, GRADE [Grade] "
+ "FROM RICH_DDL_TEST "
+ "WHERE IDENTIFIER = '1' "
+ "UNION "
+ "SELECT AREA_CODE, GRADE2[Grade] "
+ "FROM RICH_DDL_TEST "
+ "WHERE IDENTIFIER = '1' "
+ "UNION "
+ "SELECT AREA_CODE, GRADE3[Grade] "
+ "FROM RICH_DDL_TEST "
+ "WHERE IDENTIFIER = '1' "
+ "ORDER BY 2", conn);
cmd.CommandType = CommandType.Text;
SqlDataAdapter da = new SqlDataAdapter(cmd);
DataSet ds = new DataSet();
da.Fill(ds);
cmbGrade.DataSource = ds.Tables[0];
this.dgvDDL.Columns.Insert(2, cmbGrade);
this.dgvDDL.Columns[2].HeaderText = "Exp_Grade";
this.dgvDDL.Columns[2].Name = "Exp_Grade";
cmbGrade.ValueMember = "Grade";
cmbGrade.DisplayMember = "Grade";
}
catch (Exception ex)
{
MessageBox.Show(ex.Message, "Error", MessageBoxButtons.OKCancel,
MessageBoxIcon.Warning);
}
}
}
if (Convert.ToString(rw.Cells["ID"].Value) == "2")
{
if (!dgvDDL.Columns.Contains("Exp_Grade"))
{
try
{
DataGridViewComboBoxColumn cmbGrade = new DataGridViewComboBoxColumn();
SqlConnection conn = new SqlConnection(@"");
SqlCommand cmd = new SqlCommand("SELECT AREA_CODE, GRADE [Grade] "
+ "FROM RICH_DDL_TEST "
+ "WHERE IDENTIFIER = '2' "
+ "UNION "
+ "SELECT AREA_CODE, GRADE2[Grade] "
+ "FROM RICH_DDL_TEST "
+ "WHERE IDENTIFIER = '2' "
+ "UNION "
+ "SELECT AREA_CODE, GRADE3[Grade] "
+ "FROM RICH_DDL_TEST "
+ "WHERE IDENTIFIER = '2' "
+ "ORDER BY 2", conn);
cmd.CommandType = CommandType.Text;
SqlDataAdapter da = new SqlDataAdapter(cmd);
DataSet ds = new DataSet();
da.Fill(ds);
cmbGrade.DataSource = ds.Tables[0];
this.dgvDDL.Columns.Insert(2, cmbGrade);
this.dgvDDL.Columns[2].HeaderText = "Exp_Grade";
this.dgvDDL.Columns[2].Name = "Exp_Grade";
cmbGrade.ValueMember = "Grade";
cmbGrade.DisplayMember = "Grade";
}
catch (Exception ex)
{
MessageBox.Show(ex.Message, "Error", MessageBoxButtons.OKCancel,
MessageBoxIcon.Warning);
}
}
}
第二组也检查，但硬编码值：
/*foreach (DataGridViewRow rw in this.dgvDDL.Rows)
{
if (Convert.ToString(rw.Cells["ID"].Value) == "1")
{
if (!dgvDDL.Columns.Contains("Exp_Grade"))
{
try
{
DataGridViewComboBoxColumn a = new DataGridViewComboBoxColumn();
this.dgvDDL.Columns.Insert(2, a);
this.dgvDDL.Columns[2].HeaderText = "Exp_Grade";
this.dgvDDL.Columns[2].Name = "Exp_Grade";
string[] aList = new[] { "A", "B", "C" };
foreach (string str in aList)
{
a.Items.Add(str);
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message, "Error at 1", MessageBoxButtons.OKCancel,
MessageBoxIcon.Warning);
}
}
}
if (Convert.ToString(rw.Cells["ID"].Value) == "2")
{
if (!dgvDDL.Columns.Contains("Exp_Grade"))
{
try
{
DataGridViewComboBoxColumn b = new DataGridViewComboBoxColumn();
this.dgvDDL.Columns.Insert(2, B)/>/>/>;
this.dgvDDL.Columns[2].HeaderText = "Exp_Grade";
this.dgvDDL.Columns[2].Name = "Exp_Grade";
string[] bList = new[] { "D", "E", "F" };
foreach (string str in bList)
{
b.Items.Add(str);
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message, "Error at 2", MessageBoxButtons.OKCancel,
MessageBoxIcon.Warning);
}
}
}
if (Convert.ToString(rw.Cells["ID"].Value) == "3")
{
}
if (Convert.ToString(rw.Cells["ID"].Value) == "4")
{
}*/
有人能指出我正确的方向，还是指出我做错了什么？
由于
-edit完整代码如下更新：
private void DDLTest_Load（object sender，EventArgs e） { Cursor.Current = Cursors.WaitCursor;
this.dgvDDL.Focus();
try
{
SqlConnection cnSQL;
DataSet dsData;
String strQuery = "SELECT uio.course_occurrence_code [CourseCode], uio.long_description [CourseDesc], '' [Grade], uio.owning_organisation [Area], ddl.IDENTIFIER [ID] "
+ "FROM unit_instance_occurrences [uio] LEFT JOIN RICH_DDL_TEST [ddl] ON uio.UIO_ID = ddl.UIO_ID "
+ "WHERE uio.calocc_occurrence_code lIKE '16%' AND uio.owning_organisation IS NOT NULL "
+ "ORDER BY 3, 1";
//If using database class
cnSQL = database.AcquireConnection();
//If using database class
dsData = database.GetData(cnSQL, strQuery);
cnSQL.Close();
cnSQL.Dispose();
if (dsData.Tables.Count > 0)
{
dgvDDL.DataSource = dsData.Tables[0];
this.dgvDDL.Columns["Grade"].Visible = false;
this.dgvDDL.AutoGenerateColumns = false;
/*try
{
DataGridViewComboBoxColumn cmbGrade = new DataGridViewComboBoxColumn();
SqlConnection conn = new SqlConnection(@"Data Source = EBS - DB - REPORTSE; Initial Catalog = ebslive; Persist Security Info = True; User ID = sa; Password = W0rk1ngMen5");
SqlCommand cmd = new SqlCommand("SELECT AREA_CODE, 'A'[Grade] "
+ "FROM RICH_DDL_TEST "
+ "UNION "
+ "SELECT AREA_CODE, 'B'[Grade] "
+ "FROM RICH_DDL_TEST "
+ "UNION "
+ "SELECT AREA_CODE, 'C'[Grade] "
+ "FROM RICH_DDL_TEST "
+ "UNION "
+ "SELECT AREA_CODE, 'D'[Grade] "
+ "FROM RICH_DDL_TEST "
+ "UNION "
+ "SELECT AREA_CODE, 'E'[Grade] "
+ "FROM RICH_DDL_TEST "
+ "UNION "
+ "SELECT AREA_CODE, 'F'[Grade] "
+ "FROM RICH_DDL_TEST "
+ "UNION "
+ "SELECT AREA_CODE, 'G'[Grade] "
+ "FROM RICH_DDL_TEST "
+ "UNION "
+ "SELECT AREA_CODE, 'H'[Grade] "
+ "FROM RICH_DDL_TEST "
+ "UNION "
+ "SELECT AREA_CODE, 'I'[Grade] "
+ "FROM RICH_DDL_TEST "
+ "UNION "
+ "SELECT AREA_CODE, 'J'[Grade] "
+ "FROM RICH_DDL_TEST "
+ "UNION "
+ "SELECT AREA_CODE, 'K'[Grade] "
+ "FROM RICH_DDL_TEST "
+ "ORDER BY 2", conn);
cmd.CommandType = CommandType.Text;
SqlDataAdapter da = new SqlDataAdapter(cmd);
DataSet ds = new DataSet();
da.Fill(ds);
cmbGrade.DataSource = ds.Tables[0];
this.dgvDDL.Columns.Insert(2, cmbGrade);
this.dgvDDL.Columns[2].HeaderText = "Exp_Grade";
this.dgvDDL.Columns[2].Name = "Exp_Grade";
cmbGrade.ValueMember = "Grade";
cmbGrade.DisplayMember = "Grade";
}
catch (Exception ex)
{
MessageBox.Show(ex.Message, "Error", MessageBoxButtons.OKCancel,
MessageBoxIcon.Warning);
}*/
}
Int32 intRows = dsData.Tables[0].Rows.Count;
try
{
foreach (DataGridViewRow row in dgvDDL.Rows)
{
if (row.Index < intRows)
{
// row.Cells["Exp_Grade"].Value = dsData.Tables[0].Rows[row.Index]["Grade"].ToString();
}
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message, "Error detected",
MessageBoxButtons.OKCancel,
MessageBoxIcon.Warning);
}
dsData.Tables[0].Rows.Count.ToString();
}
catch (Exception ex)
{
MessageBox.Show(ex.Message, "Error detected",
MessageBoxButtons.OKCancel,
MessageBoxIcon.Warning);
}
}
private void dgvDDL_CellContentClick(object sender, DataGridViewCellEventArgs e)
{
}
private void dgvDDL_CellBeginEdit(object sender, DataGridViewCellCancelEventArgs e)
{
/* foreach (DataGridViewRow rw in this.dgvDDL.Rows)
{
bool flaga = false;
if (Convert.ToString(rw.Cells["ID"].Value) == "1")
flaga = true;
if (flaga)
{
this.dgvDDL.Columns["Grade"].Visible = false;
if (!dgvDDL.Columns.Contains("Exp_Grade"))
{
try
{
DataGridViewComboBoxColumn a = new DataGridViewComboBoxColumn();
this.dgvDDL.Columns.Insert(2, a);
this.dgvDDL.Columns[2].HeaderText = "Exp_Grade";
this.dgvDDL.Columns[2].Name = "Exp_Grade";
string[] aList = new[] { "C", "D", "E" };
foreach (string str in aList)
{
a.Items.Add(str);
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message, "Error at 1", MessageBoxButtons.OKCancel,
MessageBoxIcon.Warning);
}
}
}
else if (Convert.ToString(rw.Cells["ID"].Value) == "2")
{
this.dgvDDL.Columns["Grade"].Visible = false;
if (!dgvDDL.Columns.Contains("Exp_Grade"))
{
try
{
DataGridViewComboBoxColumn a = new DataGridViewComboBoxColumn();
this.dgvDDL.Columns.Insert(2, a);
this.dgvDDL.Columns[2].HeaderText = "Exp_Grade";
this.dgvDDL.Columns[2].Name = "Exp_Grade";
string[] aList = new[] { "D", "E", "F" };
foreach (string str in aList)
{
a.Items.Add(str);
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message, "Error at 2", MessageBoxButtons.OKCancel,
MessageBoxIcon.Warning);
}
}
}
else if (Convert.ToString(rw.Cells["ID"].Value) == "3")
{
this.dgvDDL.Columns["Grade"].Visible = false;
if (!dgvDDL.Columns.Contains("Exp_Grade"))
{
try
{
DataGridViewComboBoxColumn a = new DataGridViewComboBoxColumn();
this.dgvDDL.Columns.Insert(2, a);
this.dgvDDL.Columns[2].HeaderText = "Exp_Grade";
this.dgvDDL.Columns[2].Name = "Exp_Grade";
string[] aList = new[] { "G", "H", "I" };
foreach (string str in aList)
{
a.Items.Add(str);
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message, "Error at 3", MessageBoxButtons.OKCancel,
MessageBoxIcon.Warning);
}
}
}
else if (Convert.ToString(rw.Cells["ID"].Value) == "4")
{
this.dgvDDL.Columns["Grade"].Visible = false;
if (!dgvDDL.Columns.Contains("Exp_Grade"))
{
try
{
DataGridViewComboBoxColumn a = new DataGridViewComboBoxColumn();
this.dgvDDL.Columns.Insert(2, a);
this.dgvDDL.Columns[2].HeaderText = "Exp_Grade";
this.dgvDDL.Columns[2].Name = "Exp_Grade";
string[] aList = new[] { "J", "K", "L" };
foreach (string str in aList)
{
a.Items.Add(str);
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message, "Error at 4", MessageBoxButtons.OKCancel,
MessageBoxIcon.Warning);
}
}
}
}*/
}
private void dgvDDL_CellEndEdit(object sender, DataGridViewCellEventArgs e)
{
}
private void dgvDDL_CellValueChanged(object sender, DataGridViewCellEventArgs e)
{
try
{
if (e.ColumnIndex == 4)
{
if (dgvDDL.Rows[e.RowIndex].Cells[4].Value != null)
{
DataGridViewComboBoxCell comboCell = dgvDDL.Rows[e.RowIndex].Cells[0] as DataGridViewComboBoxCell;
if (dgvDDL.Rows[e.RowIndex].Cells[4].Value.ToString() == "1")
{
SetCombo(1, comboCell);
}
if (dgvDDL.Rows[e.RowIndex].Cells[4].Value.ToString() == "2")
{
SetCombo(2, comboCell);
}
if (dgvDDL.Rows[e.RowIndex].Cells[4].Value.ToString() == "3")
{
SetCombo(3, comboCell);
}
if (dgvDDL.Rows[e.RowIndex].Cells[4].Value.ToString() == "4")
{
SetCombo(4, comboCell);
}
}
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message, "Error", MessageBoxButtons.OKCancel,
MessageBoxIcon.Warning);
}
}
private void SetCombo (int comboType, DataGridViewComboBoxCell comboCell)
{
comboCell.Value = "";
comboCell.Items.Clear();
if (comboType == 1)
{
comboCell.Items.Add("A");
comboCell.Items.Add("B");
comboCell.Items.Add("C");
return;
}
if (comboType == 2)
{
comboCell.Items.Add("D");
comboCell.Items.Add("E");
comboCell.Items.Add("F");
return;
}
if (comboType == 3)
{
comboCell.Items.Add("G");
comboCell.Items.Add("H");
comboCell.Items.Add("I");
return;
}
if (comboType == 4)
{
comboCell.Items.Add("J");
comboCell.Items.Add("K");
comboCell.Items.Add("L");
return;
}
comboCell.Items.Add("A");
comboCell.Items.Add("B");
comboCell.Items.Add("C");
comboCell.Items.Add("D");
comboCell.Items.Add("E");
comboCell.Items.Add("F");
comboCell.Items.Add("G");
comboCell.Items.Add("H");
comboCell.Items.Add("I");
comboCell.Items.Add("J");
comboCell.Items.Add("K");
comboCell.Items.Add("L");
}
答案 0 :(得分：1)
我认为通过DaragridView循环来设置组合框不一定是最好的方法。使用此方法，用户必须按下按钮或其他一些机制才能触发此组合框更新。使用您链接的图片，您似乎希望根据“ID”列中的值，在组合框中显示不同的值。
示例，如果第0行“ID”列具有“1”，则将该行的组合框值设置为“A，B和C”。如果“ID”列中的值为2，则将该行上的组合框值设置为“D，E和F”。如果“ID”列中的值不是1或2，则不清楚要将组合框值设置为什么。我假设“A，B，C，D，E，F”
我确信有几种方法可以实现这一点，并且由于规范并不完全清楚，实现此目的的一种可能方法是在“ID”列单元格中的值更改时手动设置每个组合框。换句话说，如果“ID”列中的单元格值发生更改，我们可能需要更改该行的组合框值。这可以使用DataGridView s CellChangedEvent来实现。触发此事件时，可以检查更改的值是否在“ID”列中，如果是，则根据“ID”列中的值更新行组合框。
如果用户更改“ID”列中的值以及将数据读入网格，也会使用CellValueChanged事件更新组合框。希望这是有道理的。
下面的代码演示了这一点。 DataGridView设置为两列，第一列是组合框列，第二列是“ID”。设置列后，会添加几行。请注意，在“ID”列中的值更改之前，不会设置组合框值。如果更改“ID”列中的值，则该行上的组合框应更改为适当的值。希望这会有所帮助。
private void Form1_Load(object sender, EventArgs e) {
SetColumns();
AddRows();
}
private void SetColumns() {
DataGridViewComboBoxColumn comboColumn = new DataGridViewComboBoxColumn();
comboColumn.Name = "Grade";
comboColumn.HeaderText = "Grade";
comboColumn.ValueMember = "Grade";
comboColumn.DisplayMember = "Grade";
dataGridView1.Columns.Add(comboColumn);
dataGridView1.Columns.Add("ID", "ID");
}
private void AddRows() {
int newRowIndex = dataGridView1.Rows.Add();
dataGridView1.Rows[newRowIndex].Cells[1].Value = 1;
newRowIndex = dataGridView1.Rows.Add();
dataGridView1.Rows[newRowIndex].Cells[1].Value = 2;
newRowIndex = dataGridView1.Rows.Add();
dataGridView1.Rows[newRowIndex].Cells[1].Value = 3;
}
private void dataGridView1_CellValueChanged(object sender, DataGridViewCellEventArgs e) {
try {
if (e.ColumnIndex == 1) {
if (dataGridView1.Rows[e.RowIndex].Cells[1].Value != null) {
DataGridViewComboBoxCell comboCell = dataGridView1.Rows[e.RowIndex].Cells[0] as DataGridViewComboBoxCell;
if (dataGridView1.Rows[e.RowIndex].Cells[1].Value.ToString() == "1") {
SetCombo(1, comboCell);
} else {
if (dataGridView1.Rows[e.RowIndex].Cells[1].Value.ToString() == "2") {
SetCombo(2, comboCell);
} else {
SetCombo(3, comboCell);
}
}
}
}
}
catch (Exception ex) {
MessageBox.Show("Error: " + ex.Message);
}
}
private void SetCombo(int comboType, DataGridViewComboBoxCell comboCell) {
comboCell.Value = "";
comboCell.Items.Clear();
if (comboType == 1) {
comboCell.Items.Add("A");
comboCell.Items.Add("B");
comboCell.Items.Add("C");
return;
}
if (comboType == 2) {
comboCell.Items.Add("D");
comboCell.Items.Add("E");
comboCell.Items.Add("F");
return;
}
comboCell.Items.Add("A");
comboCell.Items.Add("B");
comboCell.Items.Add("C");
comboCell.Items.Add("D");
comboCell.Items.Add("E");
comboCell.Items.Add("F");
}