User1715683220 posted
I watched all of the videos about Dynamic Data on this site. I thought this was very cool, so I tried it out but I am getting errors centered around this code:
1 public partial
class ForeignKey_EditField : System.Web.DynamicData.FieldTemplateUserControl {
2 protected void Page_Load(object sender, EventArgs e) {
3
if (DropDownList1.Items.Count == 0) {
4
if (!Column.IsRequired) {
5
DropDownList1.Items.Add(new ListItem("[Not Set]",
""));
6 }
7
8 PopulateListControl(DropDownList1);
9 }
10 }
11
12 protected override void OnDataBinding(EventArgs e) {
13
base.OnDataBinding(e);
14
15
if (Mode == DataBoundControlMode.Edit) {
16
string foreignkey = ForeignKeyColumn.GetForeignKeyString(Row);
17 ListItem item =
DropDownList1.Items.FindByValue(foreignkey);
18
if (item != null) {
19 DropDownList1.SelectedValue = foreignkey;
20 }
21 }
22 }
23
24 protected override void ExtractValues(IOrderedDictionary dictionary) {
25
// If it's an empty string, change it to null
26
string val = DropDownList1.SelectedValue;
27
if (val == String.Empty)
28 val =
null;
29
30 ExtractForeignKey(dictionary, val);
31 }
32
33 public override Control DataControl {
34
get {
35
return DropDownList1;
36 }
37 }
38 }
39
Underlined is what VS 2008 underlines. Errors for each underlined code are:
Error 1 'ListItem' does not contain a constructor that takes '2' arguments
Error 2 The best overloaded method match for 'System.Web.UI.WebControls.ListItemCollection.Add(string)' has some invalid arguments
Error 3 Argument '1': cannot convert from 'ListItem' to 'string'
Error 4 Cannot implicitly convert type 'System.Web.UI.WebControls.ListItem' to 'ListItem'
Here is the definition for ListItem that Dynamic Data generates:
1 [Table(Name="dbo.ListItems")]
2 public partial class ListItem : INotifyPropertyChanging, INotifyPropertyChanged
3 {
4
5 private static PropertyChangingEventArgs emptyChangingEventArgs = new PropertyChangingEventArgs(String.Empty);
6
7 private int _ListID;
8
9 private int _ListItemID;
10
11 private string _ListItem1;
12
13 private EntityRef<LIST> _List;
14
15 #region Extensibility Method Definitions
16 partial void OnLoaded();
17 partial void OnValidate(System.Data.Linq.ChangeAction action);
18 partial void OnCreated();
19 partial void OnListIDChanging(int value);
20 partial void OnListIDChanged();
21 partial void OnListItemIDChanging(int value);
22 partial void OnListItemIDChanged();
23 partial void OnListItem1Changing(string value);
24 partial void OnListItem1Changed();
25 #endregion
26
27 public ListItem()
28 {
29 this._List = default(EntityRef<LIST>);
30 OnCreated();
31 }
32
33 [Column(Storage="_ListID", DbType="Int NOT NULL")]
34 public int ListID
35 {
36 get
37 {
38 return this._ListID;
39 }
40 set
41 {
42 if ((this._ListID != value))
43 {
44 if (this._List.HasLoadedOrAssignedValue)
45 {
46 throw new System.Data.Linq.ForeignKeyReferenceAlreadyHasValueException();
47 }
48 this.OnListIDChanging(value);
49 this.SendPropertyChanging();
50 this._ListID = value;
51 this.SendPropertyChanged("ListID");
52 this.OnListIDChanged();
53 }
54 }
55 }
56
57 [Column(Storage="_ListItemID", AutoSync=AutoSync.OnInsert, DbType="Int NOT NULL IDENTITY", IsPrimaryKey=true, IsDbGenerated=true)]
58 public int ListItemID
59 {
60 get
61 {
62 return this._ListItemID;
63 }
64 set
65 {
66 if ((this._ListItemID != value))
67 {
68 this.OnListItemIDChanging(value);
69 this.SendPropertyChanging();
70 this._ListItemID = value;
71 this.SendPropertyChanged("ListItemID");
72 this.OnListItemIDChanged();
73 }
74 }
75 }
76
77 [Column(Name="ListItem", Storage="_ListItem1", DbType="NVarChar(100) NOT NULL", CanBeNull=false)]
78 public string ListItem1
79 {
80 get
81 {
82 return this._ListItem1;
83 }
84 set
85 {
86 if ((this._ListItem1 != value))
87 {
88 this.OnListItem1Changing(value);
89 this.SendPropertyChanging();
90 this._ListItem1 = value;
91 this.SendPropertyChanged("ListItem1");
92 this.OnListItem1Changed();
93 }
94 }
95 }
96
97 [Association(Name="List_ListItem", Storage="_List", ThisKey="ListID", OtherKey="ListID", IsForeignKey=true)]
98 public List List
99 {
100 get
101 {
102 return this._List.Entity;
103 }
104 set
105 {
106 List previousValue = this._List.Entity;
107 if (((previousValue != value)
108 || (this._List.HasLoadedOrAssignedValue == false)))
109 {
110 this.SendPropertyChanging();
111 if ((previousValue != null))
112 {
113 this._List.Entity = null;
114 previousValue.ListItems.Remove(this);
115 }
116 this._List.Entity = value;
117 if ((value != null))
118 {
119 value.ListItems.Add(this);
120 this._ListID = value.ListID;
121 }
122 else
123 {
124 this._ListID = default(int);
125 }
126 this.SendPropertyChanged("List");
127 }
128 }
129 }
130
131 public event PropertyChangingEventHandler PropertyChanging;
132
133 public event PropertyChangedEventHandler PropertyChanged;
134
135 protected virtual void SendPropertyChanging()
136 {
137 if ((this.PropertyChanging != null))
138 {
139 this.PropertyChanging(this, emptyChangingEventArgs);
140 }
141 }
142
143 protected virtual void SendPropertyChanged(String propertyName)
144 {
145 if ((this.PropertyChanged != null))
146 {
147 this.PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
148 }
149 }
150 }
Can anyone comment?
