.NET MVC padding data in a drop-down box

View of the model binding in MVC, very often use the drop-down box, so the drop-down box method to populate the data according to the data in the DataTable about this record

. 1   　　　　///  <Summary> 
2          /// will turn into a drop-down box DataTable padding data List <SelectListItem> type
 . 3          ///  </ Summary> 
. 4          ///  <param name = "dt"> Data DataTable </ param > 
. 5          ///  <param name = "keyColumnName"> display text column </ param> 
. 6          ///  <param name = "valueColumnName"> select the value column </ param> 
. 7          ///  <param name = "Please has select "> whether select </ param> 
. 8          ///  <param name =" choose has text "> select the default text select = = </ param>
 9         /// <param name="defaultValue">The default value of the drop down box </ param> 
10          ///  <Returns> </ Returns> 
. 11          public  static List <SelectListItem> bindValues (the DataTable dt, String keyColumnName, String valueColumnName, BOOL has select = to false , String has select = the Text "" , String defaultValue = "" )
 12 is          {
 13 is              List <SelectListItem> List = new new List <SelectListItem> ();
 14              IF (has select)
 15              {
 16                 SelectListItem item = new SelectListItem() { Text = has请选择Text == "" ? “=请选择=” : has请选择Text, Value = "" };
17                 list.Add(item);
18             }
19 
20             
21             if (dt.Rows.Count == 0)
22                 return list;
23             List<Tuple<string, string>> valueList = DataTableToList(dt, keyColumnName, valueColumnName);
24             foreach (var item in valueList)
25             {
26                 if (defaultValue != “” && defaultValue.Contains(item.Item1))
27                     list.Add(new SelectListItem() { Text = item.Item2, Value = item.Item1, Selected = true });
28                 else
29                     list.Add(new SelectListItem() { Text = item.Item2, Value = item.Item1, Selected = false });
30             }
31             return list;
32         }

 

This method is specified DataTable multiple columns of data as a text display, select a listed value, then a List of items to be stored according to the tuple Tuple. Tuple is C # 7.0 new out, are interested you can find out.

. 1          ///  <Summary> 
2          /// will turn into DataTable List
 . 3          ///  </ Summary> 
. 4          ///  <param name = "Table"> to turn DataTable </ param> 
. 5          ///  <param name = "keyColumnName"> Specifies the text display column </ param> 
. 6          ///  <param name = "valueColumnName"> specified value selected column </ param> 
. 7          ///  <Returns> </ Returns> 
. 8          public  static List < tuple < String , String >> DataTableToList (the DataTable Table, String keyColumnName,string valueColumnName)
 9         {
10             List<Tuple<string, string>> list = new List<Tuple<string, string>>();
11             if (table.Rows.Count == 0)
12                 return null;
13             for (int i = 0; i < table.Rows.Count; i++)
14             {
15                 list.Add(new Tuple<string, string>(table.Rows[i][keyColumnName].ToString(), table.Rows[i][valueColumnName].ToString()));
16             }
17             return list;
18         }