C# WebControls.ListControl類代碼示例

 public static void Fillchk(ListControl control, string key, string value, object data)
 {
     control.DataSource = data;
     control.DataValueField = key;
     control.DataTextField = value;
     control.DataBind();
 }

 public McssWebQuestion(string strId, bool bRequired, string strRequiredText, string strQuestion, string strControlBase, RepeatDirection rdLayout, string[] strResponses)
     : base(strId, "mcss", bRequired, strRequiredText, strQuestion)
 {
     this.m_radioButtonList = new RadioButtonList();
     this.m_dropDownList = new DropDownList();
     this.m_listControl = null;
     if (strControlBase == "dropdown")
     {
         this.m_listControl = this.m_dropDownList;
     }
     else
     {
         this.m_radioButtonList.RepeatDirection = rdLayout;
         this.m_listControl = this.m_radioButtonList;
     }
     foreach (string text in strResponses)
     {
         this.m_listControl.Items.Add(new ListItem(text));
     }
     this.m_listControl.ID = "lst_" + strId;
     if (bRequired)
     {
         ListControlValidator child = new ListControlValidator();
         child.EnableClientScript = false;
         child.Text = strRequiredText;
         child.Display = ValidatorDisplay.Dynamic;
         child.ControlToValidate = this.m_listControl.ID;
         this.Controls.Add(child);
     }
     this.Controls.Add(this.m_listControl);
     this.Controls.Add(new LiteralControl("</p>"));
 }

        public new void PopulateListControl2(ListControl listControl)
        {
            var filterAttribute = Column.GetAttribute<FilterForeignKeyAttribute>();
               if (filterAttribute == null || Session[filterAttribute.SessionVariableName] == null)
               {
                    base.PopulateListControl(listControl);
                    return;
               }

               var context = Column.Table.CreateContext();
               var foreignKeyTable = ForeignKeyColumn.ParentTable;
               var filterColumn = foreignKeyTable.GetColumn(filterAttribute.FilterColumnName);
               var value = Convert.ChangeType(Session[filterAttribute.SessionVariableName].ToString(), filterColumn.TypeCode, CultureInfo.InvariantCulture);

               var query = foreignKeyTable.GetQuery(context); // Get Column Value query
               var entityParam = Expression.Parameter(foreignKeyTable.EntityType, foreignKeyTable.Name); // get the table entity to be filtered
               var property = Expression.Property(entityParam, filterColumn.Name); // get the property to be filtered
               var equalsCall = Expression.Equal(property, Expression.Constant(value)); // get the equal call
               var whereLambda = Expression.Lambda(equalsCall, entityParam); // get the where lambda
               var whereCall = Expression.Call(typeof(Queryable), "Where", new Type[] { foreignKeyTable.EntityType }, query.Expression, whereLambda); // get the where call
               var values = query.Provider.CreateQuery(whereCall);
               foreach (var row in values)
               {
                    listControl.Items.Add(new ListItem()
                    {
                         Text = foreignKeyTable.GetDisplayString(row),
                         Value = foreignKeyTable.GetPrimaryKeyString(row)
                    });
               }
        }

 /// <summary>
 /// Constructs a new list property binding for the given ListControl element.
 /// </summary>
 /// <param name="list">The list control to be bound to the data property.</param>
 protected ListPropertyBinding(ListControl list)
     : base(list)
 {
     bool isMultiVal = control is ListBox || control is CheckBoxList;
     // ListBox and CheckBoxList post values on selection change, since deselecting all has no post value
     // and we have to use selection change to detect this as opposed to no post at all
     if (isMultiVal)
     {
         PostedValue = null;
         list.SelectedIndexChanged += delegate
         {
             if (isMultiVal && property != null && control.Page != null)
             {
                 PostedValue = control.Page.Request.Form[control.UniqueID] ?? "";
                 // for CheckBoxList each item is posted individually, so we just reconstruct it
                 // from the selected item, since LoadPostData should have happened by now.
                 if (control is CheckBoxList)
                 {
                     List<string> newValues = new List<string>();
                     foreach (ListItem item in list.Items)
                         if (item.Selected && !newValues.Contains(item.Value)) newValues.Add(item.Value);
                     PostedValue = string.Join(",", newValues.ToArray());
                 }
                 UpdateProperty(PostedValue);
             }
         };
     }
 }

 public static void FillRange(ListControl control, int min = 1, int max = 10)
 {
     control.DataSource = GetRange(min, max);
     control.DataValueField = "key";
     control.DataTextField = "value";
     control.DataBind();
 }

        /// <summary>
        /// Populate a ListControl with all the items in the foreign table
        /// </summary>
        /// <param name="listControl"></param>
        /// <param name="dataSource"></param>
        /// <parm name="valueField"></parm>
        /// <parm name="defaultTextField"></parm>
        protected void PopulateListControl(ListControl listControl, IQueryable dataSource, string valueField)
        {
            var filterdata = new List<KeyValuePair<string, string>>();
            string textField = string.Empty;

            if (dataSource != null)
            {
                if (_filterFields.ForeignText != string.Empty)
                {
                    if (CheckDropDownTextField(_filterFields.ForeignText, dataSource.ElementType)) {
                        textField = _filterFields.ForeignText;
                    }
                }

                if (textField == string.Empty) {
                    textField = FindDropDownTextField(Column.FieldName, dataSource.ElementType);
                }

                foreach (object dataItem in dataSource) {
                    filterdata.Add(new KeyValuePair<string, string>(DataBinder.GetPropertyValue(dataItem, textField, null), DataBinder.GetPropertyValue(dataItem, valueField, null)));
                }

                if (_filterFields.SortField == "Yes")
                {
                    if (_filterFields.SortDescending)
                        filterdata.Sort(CompareDesc);
                    else
                        filterdata.Sort(CompareAsc);
                }

                foreach (KeyValuePair<string, string> keyvalue in filterdata) {
                    listControl.Items.Add(new ListItem(keyvalue.Key, _filterFields.FieldName + ":" + keyvalue.Value));
                }
            }
        }

 public static void Flip(Label lbl, ListControl lst, bool blnReadOnly)
 {
     lbl.Visible = blnReadOnly;
     lst.Visible = !blnReadOnly;
     if (blnReadOnly)
     {
         lbl.Text = "";
         foreach (ListItem item in lst.Items)
         {
             if (item.Selected)
             {
                 lbl.Text = lbl.Text + "<br>" + item.Text;
             }
         }
         if (lbl.Text != "")
         {
             lbl.Text = lbl.Text.Remove(0, 4);
         }
     }
     else
     {
         string str = lbl.Text.Replace("<br>", ",");
         if (str != "")
         {
             foreach (string str2 in str.Split(new char[] { ',' }))
             {
                 SelectedByText(lst, str2);
             }
         }
     }
 }

		public static int? GetSelectedInt(ListControl ddl) {
			int? iVal = null;
			if (ddl.SelectedItem != null) {
				iVal = int.Parse(ddl.SelectedValue);
			}
			return iVal;
		}

 public static void Bind2Ddl(ListControl ddl, DataTable dt, string textField, string valueField)
 {
     ddl.DataSource = dt;
     ddl.DataTextField = textField;
     ddl.DataValueField = valueField;
     ddl.DataBind();
 }

 public static void BindList(ListControl _ltControl, bool _bIncludeSel, bool _bIncludeAll, bool _bIncludeTip)
 {
     if (null != _ltControl)
     {
         _ltControl.Items.Clear();
         if (_bIncludeAll)
         {
             _ltControl.Items.Add(new ListItem("--全部--", ""));
         }
         if (_bIncludeSel)
         {
             _ltControl.Items.Add(new ListItem("--請選擇--", ""));
         }
         SystemRole[] alist = SystemRole.List();
         if (alist != null && alist.Length != 0)
         {
             SystemRole[] array = alist;
             for (int i = 0; i < array.Length; i++)
             {
                 SystemRole item = array[i];
                 ListItem li = new ListItem(item.Name, string.Concat(item.Id));
                 if (_bIncludeTip)
                 {
                     li.Attributes["title"] = item.Description;
                 }
                 _ltControl.Items.Add(li);
             }
         }
     }
 }

		public static Guid? GetSelectedGuid(ListControl ddl) {
			Guid? gVal = null;
			if (ddl.SelectedItem != null) {
				gVal = new Guid(ddl.SelectedValue);
			}
			return gVal;
		}

 protected override object GetValue(ListControl ddl)
 {
     if (!string.IsNullOrEmpty(ddl.SelectedValue))
         return GetEnumValue(int.Parse(ddl.SelectedValue));
     else
         return null;
 }

 public static void BindList(ListControl _ltControl, bool _bIncludeSel, bool _bIncludeAll)
 {
     if (null != _ltControl)
     {
         _ltControl.Items.Clear();
         if (_bIncludeAll)
         {
             _ltControl.Items.Add(new ListItem("--全部--", ""));
         }
         if (_bIncludeSel)
         {
             _ltControl.Items.Add(new ListItem("--請選擇--", ""));
         }
         SystemOrganization[] alist = SystemOrganization.List();
         if (alist != null && alist.Length != 0)
         {
             SystemOrganization[] array = alist;
             for (int i = 0; i < array.Length; i++)
             {
                 SystemOrganization item = array[i];
                 ListItem li = new ListItem(item.Name, string.Concat(item.Id));
                 _ltControl.Items.Add(li);
             }
         }
     }
 }

        public static void AddListItems(ListControl control, string keys, string values, string selectedValues)
        {
            if (control == null)
            {
                return;
            }

            if (string.IsNullOrWhiteSpace(keys))
            {
                return;
            }

            if (string.IsNullOrWhiteSpace(values))
            {
                return;
            }

            var key = keys.Split(',');
            var value = values.Split(',');

            if (key.Count() != value.Count())
            {
                throw new InvalidOperationException("Key or value count mismatch. Cannot add items to " + control.ID);
            }

            for (var i = 0; i < key.Length; i++)
            {
                var item = new ListItem(key[i].Trim(), value[i].Trim());
                control.Items.Add(item);
            }

            foreach (ListItem item in control.Items)
            {
                //Checkbox list allows multiple selection.
                if (control is CheckBoxList)
                {
                    if (!string.IsNullOrWhiteSpace(selectedValues))
                    {
                        foreach (var selectedValue in selectedValues.Split(','))
                        {
                            if (item.Value.Trim().Equals(selectedValue.Trim()))
                            {
                                item.Selected = true;
                            }
                        }
                    }
                }
                else
                {
                    if (!string.IsNullOrWhiteSpace(selectedValues))
                    {
                        if (item.Value.Trim().Equals(selectedValues.Split(',').Last().Trim()))
                        {
                            item.Selected = true;
                            break;
                        }
                    }
                }
            }
        }

 // This function binds the given RadioButtonList with the given data table with respect to the data text field and the value field.
 public static void Bind2RadioButtonList(ListControl rbl, DataTable dt, string textField, string valueField)
 {
     rbl.DataSource = dt;
     rbl.DataTextField = textField;
     rbl.DataValueField = valueField;
     rbl.DataBind();
 }