DataGridView、List<T>相关操作

一、DataGridView数据转成DataTable

1.已绑定过数据源：
DataTable dt = (dataGridView1.DataSource as DataTable)

2.未绑定过数据源：
public DataTable GetDgvToTable(DataGridView dgv)
{
DataTable dt = new DataTable();

// 列强制转换
for (int count = 0; count < dgv.Columns.Count; count++)
{
DataColumn dc = new DataColumn(dgv.Columns[count].Name.ToString());
dt.Columns.Add(dc);
}

// 循环行
for (int count = 0; count < dgv.Rows.Count; count++)
{
DataRow dr = dt.NewRow();
for (int countsub = 0; countsub < dgv.Columns.Count; countsub++)
{
dr[countsub] = Convert.ToString(dgv.Rows[count].Cells[countsub].Value);
}
dt.Rows.Add(dr);
}
return dt;
}

二、

1.刷新：重新绑定
2.清空：绑定null

3、 dataGridView1.ColumnHeadersDefaultCellStyle.WrapMode = DataGridViewTriState.False; 第一列隐藏

dataGridView1.SelectionMode = DataGridViewSelectionMode.FullRowSelect; 行选中模式

4、动态绑定列名
foreach (DataColumn dataColumn in AppDataSet.Tables[0].Columns)
{
DataColumnSrv dataColumnSrv = new DataColumnSrv(dataColumn);
if (dataColumnSrv.IsQuery)
{
myStyleDataGridView1.Columns.Add(dataColumn.ColumnName, dataColumn.Caption);
myStyleDataGridView1.Columns[dataColumn.ColumnName].DataPropertyName = dataColumn.ColumnName;
myStyleDataGridView1.Columns[dataColumn.ColumnName].ReadOnly = true;

}
}

三、

1.声明全局变量对象：public object Message { get; set; }

2.选中当前行

DataRow dataRow = (this.myDataGridView1.CurrentRow.DataBoundItem as DataRowView).Row;

3、存储在泛型List<T>对象中

List<DataRow> list = new List<DataRow>() { dataRow };
this.Message = list;

4.变量保存选中的行

List<string> rets = new List<string>();
foreach (DataGridViewRow item in dgv.Rows)
{
if (item.Cells[0].Value + "" == "1")
{
rets.Add(item.Cells["CZDepart"].Value + "");
}
}

this.Message = rets;

5、List中去重复，并用"-"连接起来

List<string> rets = pop.Message as List<string>;
if (rets != null)
{
DataRow dataRow = FormUtil.GetCurrentRow(AppBindingSources, dgv.BindTable);
if (dataRow == null)
return;
string col003 = dataRow["Col_003"] + "";
if (!col003.IsNullOrWhiteSpace())
{
rets.AddRange(col003.Split('-'));
}
rets.Remove("");
dataRow["Col_003"] = string.Join("-", rets.Distinct());//去重复，并用"-"连接起来
}

6.选定行转DataTable

DataTable dtTemp = dgv1.SelectedDataRows.CopyToDataTable();

7.DataGrideView转到DatTable
public static DataTable DataTableChangeColumnName(MyDataGridView dgv, DataTable dtImport)
{
if (dtImport == null) { return null; }

DataTable dtCheck = null;

//列名集合找到，替换
dtImport.TableName = dgv.BindTableName;
dtCheck = dtImport.Copy();
foreach (DataColumn dc in dtCheck.Columns)
{
for (int i = 0; i < dgv.Columns.Count; i++)
{
if (dc.ColumnName.Trim().Equals(dgv.Columns[i].HeaderText.Trim()))
{
dc.ColumnName = dgv.Columns[i].DataPropertyName.Trim();
}
}
}
return dtCheck;
}

8.编辑状态下，取消事件

//编辑状态下
private void dgv_CellBeginEdit(object sender, DataGridViewCellCancelEventArgs e)
{
if (dgv.Columns[e.ColumnIndex].Name == "Col_003")
{
e.Cancel = true;

}
}

9、 键值对用法

汇总
private void getTotal()
{
dict.Clear();
for (int i = 0; i < this.dataGridView1.RowCount; i++)
{

if ((dataGridView1.Rows[i].Cells["IsSelect"].Value + "").ToUpper() == "TRUE")
{
if (!dict.ContainsKey(dataGridView1.Rows[i].Cells["公司名称"].Value + "") || !dict.ContainsValue(dataGridView1.Rows[i].Cells["类型"].Value + ""))
dict.Add(dataGridView1.Rows[i].Cells["公司名称"].Value + "", dataGridView1.Rows[i].Cells["类型"].Value + "");
}
}
}

遍历
foreach (KeyValuePair<string, string> kvp in dict)
{
if (kvp.Value.Equals("取"))
{
mSql += string.Format("UPDATE Table1 SET PickDiffDegree ={0} WHERE Company=N'{1}' ;" + Environment.NewLine, mNdNumber, kvp.Key);
}
}