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 }