DevExpress:下拉框绑定数据源 (ComboBoxEdit,LookUpEdit)

DevExpress:下拉框绑定数据源 (ComboBoxEdit,LookUpEdit)

 DevExpress:下拉框绑定数据源 (ComboBoxEdit,LookUpEdit)

 //  设置下拉框   传入参数(需要设置的下拉框控件，查询的语句，默认第一行的内容)
 public static void SetComboList(DevExpress.XtraEditors.ComboBoxEdit ComboList, string QuerySQL, string FirstRowText = "",bool bSelectFirstItem=false)
 {
     DataTable dtList=null;
     try
     {
         dtList = sqlHelper.ExecuteDataTable(Common.ConnString, CommandType.Text, QuerySQL, null);
     }
     catch (Exception ex)
     {
         frm0201.DisplayMsg("数据访问异常:", ex.Message.ToString());
         return;
     }  

     int intCount = (dtList!=null) ? dtList.Rows.Count : ;
     ComboList.Properties.TextEditStyle = TextEditStyles.DisableTextEditor; // 设置 comboBox的文本值不能被编辑
     ComboList.Properties.Items.Clear();
     if (!string.IsNullOrEmpty(FirstRowText)) ComboList.Properties.Items.Add(FirstRowText);  

     if (intCount > )
     {
         for (int i = ; i < intCount; i++)
         {
             ComboList.Properties.Items.Add(dtList.Rows[i][].ToString());
         }
     }
     if (bSelectFirstItem) ComboList.SelectedIndex = ; // 设置选中第1项
 }  

 //设置下拉框   loe 为下拉框名, sSql 为下拉框的数据来源
 public static void SetLookUpList(ref DevExpress.XtraEditors.LookUpEdit loeSource, string strSQL, int ValueCol = , int NameCol = ,DataTable dtSource=null,bool bSelectFirstItem=false,string sFirstRowText="")
 {
     DataTable dt =null;  

     try
     {
         if (!string.IsNullOrEmpty(strSQL))
         {
             dt = sqlHelper.ExecuteDataTable(Common.ConnString, CommandType.Text, strSQL, null);
         }
         else if (dtSource != null)
         {
             dt = dtSource.Copy();
         }
     }
     catch (Exception ex)
     {
         frm0201.DisplayMsg("数据访问异常:", ex.Message.ToString());
         return;
     }  

     loeSource.Properties.Columns.Clear();
     loeSource.Properties.DataSource = null;  

     if (dt!=null && dt.Rows.Count >  && dt.Columns.Count > ) // 一般为2列: id列 和 value 列
     {
         loeSource.Properties.Columns.Add(new LookUpColumnInfo(dt.Columns[ValueCol].ColumnName.ToString()));
         loeSource.Properties.Columns[ValueCol].Visible = false; // 隐藏id列
         loeSource.Properties.Columns.Add(new LookUpColumnInfo(dt.Columns[NameCol].ColumnName.ToString()));  

         if (!string.IsNullOrEmpty(sFirstRowText))
         {
             DataRow dr = dt.NewRow();
             dr[dt.Columns[ValueCol]] = -; // 这一项的 ID 值为 -1
             dr[dt.Columns[NameCol]] = sFirstRowText;
             dt.Rows.InsertAt(dr, );// 从索引为0的位置插入
         }  

         loeSource.Properties.DataSource = dt;
         loeSource.Properties.ValueMember = dt.Columns[ValueCol].ColumnName; // 对应ID
         loeSource.Properties.DisplayMember = dt.Columns[NameCol].ColumnName; // 显示内容  

         if (bSelectFirstItem) // 是否选中第一项
         {
             int iID=;
             if(Int32.TryParse(dt.Rows[][].ToString(),out iID))
             {
                 loeSource.EditValue = iID;
             }
         }
     }  

     loeSource.Properties.ShowHeader = false;
     loeSource.Properties.ShowFooter = false;
     loeSource.Properties.NullText = "";
 }  

 // 得到下拉框 的内容项,以Keys.Tab拼成一个字符串
 public static string GetComboList(string sQuerySQL)
 {
     try
     {
         DataTable dtList = sqlHelper.ExecuteDataTable(Common.ConnString, CommandType.Text, sQuerySQL, null);
         if (dtList!=null && dtList.Rows.Count >  && dtList.Columns.Count == ) // 有数据且只有一列
         {
             string sResult = string.Empty;
             for (int i = ; i < dtList.Rows.Count; i++)
             {
                 sResult += dtList.Rows[i][].ToString() + Convert.ToChar(Keys.Tab);
             }  

             if (sResult.Length > )
             {
                 sResult = sResult.Remove(sResult.Length - );
             }
             return sResult;
         }
     }
     catch (Exception ex)
     {
         XtraMessageBox.Show(ex.Message.ToString());
     }  

     return "";
 }