C# Combobox

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using System; using System.Collections.Generic; using System.Data; using System.Linq; using System.Reflection; using System.Text; using System.Windows.Forms;   namespace KK.Control.Helper {     public class CmbHelper     {         //定义一个用于保存静态变量的实例         private static CmbHelper instance = null;         //定义一个保证线程同步的标识         private static readonly object locker = new object();         //构造函数为私有，使外界不能创建该类的实例         private CmbHelper() { }         public static CmbHelper Instance         {             get             {                 if (instance == null)                 {                     lock (locker)                     {                         if (instance == null) instance = new CmbHelper();                     }                 }                 return instance;             }         }           public TModel GetTModel<TModel>(ComboBox cmb)         {             //ZB.QueueSys.Model.QS_QUEUE queue = this.cmbQueue.SelectedItem as ZB.QueueSys.Model.QS_QUEUE;             //StudentInfos stu = CmbHelper.Instance.GetTModel<StudentInfos>(this.cmbTest);             return (TModel)cmb.SelectedItem;         }           public void BindingCmb<TModel>(List<TModel> list, ComboBox cmb, string displayMember)         {             if (list == null || list.Count <= 0)             {                 cmb.DataSource = null;                 return;             }             cmb.DataSource = list;             cmb.DisplayMember = displayMember;             cmb.SelectedIndex = 0;             //List<V_APPLYDEPART> departs = AppDepartBLL.GetApplyDeparts();             //if (departs != null && departs.Count > 0) departs.Insert(0, new V_APPLYDEPART { APPLYDEPART = PubVariable.All, DEPARTID = "-1" });             //PubHelper.Instance.BindingCmb(departs, this.cmbDepart, "APPLYDEPART");         }           public void BindingCmbAndInsetAll<TModel>(List<TModel> list, ComboBox cmb, string displayMember, string all = "全部")         {             if (list == null || list.Count <= 0)             {                 cmb.DataSource = null;                 return;             }             cmb.Items.Clear();             cmb.Items.Add(all);             foreach (TModel item in list)             {                 cmb.Items.Add(item);             }             //cmb.DataSource = list;             cmb.DisplayMember = displayMember;             cmb.SelectedIndex = 0;             //PubHelper.Instance.BindingCmb(departs, this.cmbDepart, "APPLYDEPART");         }           /// <summary>         /// 为ComboBox绑定数据源并提供下拉提示         /// </summary>         /// <typeparam name="T">泛型</typeparam>         /// <param name="combox">ComboBox</param>         /// <param name="list">数据源</param>         /// <param name="displayMember">显示字段</param>         /// <param name="valueMember">隐式字段</param>         /// <param name="displayText">下拉提示文字</param>         public void Bind<T>(ComboBox combox, IList<T> list, string displayMember, string valueMember, string displayText = "全部")         {             AddItem(list, displayMember, displayText);             combox.DataSource = list;             combox.DisplayMember = displayMember;             if (!string.IsNullOrEmpty(valueMember))                 combox.ValueMember = valueMember;         }           private void AddItem<T>(IList<T> list, string displayMember, string displayText)         {             Object _obj = Activator.CreateInstance<T>();             Type _type = _obj.GetType();             if (!string.IsNullOrEmpty(displayMember))             {                 PropertyInfo _displayProperty = _type.GetProperty(displayMember);                 _displayProperty.SetValue(_obj, displayText, null);             }             list.Insert(0, (T)_obj);         }         } }