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

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

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

  2 

  3  

  4 //  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)  

  5 public static void SetComboList(DevExpress.XtraEditors.ComboBoxEdit ComboList, string QuerySQL, string FirstRowText = "",bool bSelectFirstItem=false)  

  6 {  

  7     DataTable dtList=null;  

  8     try  

  9     {  

 10         dtList = sqlHelper.ExecuteDataTable(Common.ConnString, CommandType.Text, QuerySQL, null);  

 11     }  

 12     catch (Exception ex)  

 13     {  

 14         frm0201.DisplayMsg("数据访问异常:", ex.Message.ToString());  

 15         return;  

 16     }  

 17   

 18     int intCount = (dtList!=null) ? dtList.Rows.Count : 0;  

 19     ComboList.Properties.TextEditStyle = TextEditStyles.DisableTextEditor; // 设置 comboBox的文本值不能被编辑  

 20     ComboList.Properties.Items.Clear();  

 21     if (!string.IsNullOrEmpty(FirstRowText)) ComboList.Properties.Items.Add(FirstRowText);  

 22   

 23     if (intCount > 0)  

 24     {  

 25         for (int i = 0; i < intCount; i++)  

 26         {  

 27             ComboList.Properties.Items.Add(dtList.Rows[i][0].ToString());  

 28         }  

 29     }  

 30     if (bSelectFirstItem) ComboList.SelectedIndex = 0; // 设置选中第1项  

 31 }  

 32   

 33 //设置下拉框   loe 为下拉框名, sSql 为下拉框的数据来源  

 34 public static void SetLookUpList(ref DevExpress.XtraEditors.LookUpEdit loeSource, string strSQL, int ValueCol = 0, int NameCol = 1,DataTable dtSource=null,bool bSelectFirstItem=false,string sFirstRowText="")  

 35 {  

 36     DataTable dt =null;  

 37   

 38     try  

 39     {  

 40         if (!string.IsNullOrEmpty(strSQL))  

 41         {  

 42             dt = sqlHelper.ExecuteDataTable(Common.ConnString, CommandType.Text, strSQL, null);  

 43         }  

 44         else if (dtSource != null)  

 45         {  

 46             dt = dtSource.Copy();  

 47         }  

 48     }  

 49     catch (Exception ex)  

 50     {  

 51         frm0201.DisplayMsg("数据访问异常:", ex.Message.ToString());  

 52         return;  

 53     }  

 54   

 55     loeSource.Properties.Columns.Clear();  

 56     loeSource.Properties.DataSource = null;  

 57   

 58     if (dt!=null && dt.Rows.Count > 0 && dt.Columns.Count > 1) // 一般为2列: id列 和 value 列  

 59     {  

 60         loeSource.Properties.Columns.Add(new LookUpColumnInfo(dt.Columns[ValueCol].ColumnName.ToString()));  

 61         loeSource.Properties.Columns[ValueCol].Visible = false; // 隐藏id列  

 62         loeSource.Properties.Columns.Add(new LookUpColumnInfo(dt.Columns[NameCol].ColumnName.ToString()));  

 63   

 64         if (!string.IsNullOrEmpty(sFirstRowText))  

 65         {  

 66             DataRow dr = dt.NewRow();  

 67             dr[dt.Columns[ValueCol]] = -1; // 这一项的 ID 值为 -1  

 68             dr[dt.Columns[NameCol]] = sFirstRowText;  

 69             dt.Rows.InsertAt(dr, 0);// 从索引为0的位置插入  

 70         }  

 71   

 72         loeSource.Properties.DataSource = dt;  

 73         loeSource.Properties.ValueMember = dt.Columns[ValueCol].ColumnName; // 对应ID  

 74         loeSource.Properties.DisplayMember = dt.Columns[NameCol].ColumnName; // 显示内容  

 75   

 76         if (bSelectFirstItem) // 是否选中第一项  

 77         {  

 78             int iID=0;  

 79             if(Int32.TryParse(dt.Rows[0][0].ToString(),out iID))  

 80             {  

 81                 loeSource.EditValue = iID;  

 82             }  

 83         }  

 84     }  

 85   

 86     loeSource.Properties.ShowHeader = false;  

 87     loeSource.Properties.ShowFooter = false;  

 88     loeSource.Properties.NullText = "";  

 89 }  

 90   

 91 // 得到下拉框 的内容项,以Keys.Tab拼成一个字符串   

 92 public static string GetComboList(string sQuerySQL)  

 93 {  

 94     try  

 95     {  

 96         DataTable dtList = sqlHelper.ExecuteDataTable(Common.ConnString, CommandType.Text, sQuerySQL, null);  

 97         if (dtList!=null && dtList.Rows.Count > 0 && dtList.Columns.Count == 1) // 有数据且只有一列  

 98         {  

 99             string sResult = string.Empty;  

100             for (int i = 0; i < dtList.Rows.Count; i++)  

101             {  

102                 sResult += dtList.Rows[i][0].ToString() + Convert.ToChar(Keys.Tab);  

103             }  

104   

105             if (sResult.Length > 1)  

106             {  

107                 sResult = sResult.Remove(sResult.Length - 1);  

108             }  

109             return sResult;  

110         }  

111     }  

112     catch (Exception ex)  

113     {  

114         XtraMessageBox.Show(ex.Message.ToString());  

115     }  

116   

117     return "";  

118 }