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WinForm实现基于BindingSource的方法扩展

2014-08-20 08:47 543 查看

本文实例展示了WinForm实现基于BindingSource的方法扩展，共享给大家供大家参考。具体方法如下：

关键代码如下：

using System;
using System.Collections.Generic;
using System.Reflection;
using System.Windows.Forms;
namespace WinFormUtilHelpV2
{
/// <summary>
/// 基于.NET 2.0的BindingSource工具类
/// </summary>
public static class BindingSourceToolV2
{
/// <summary>
/// 获取Control的BindingSource
/// </summary>
/// <param name="control">Control</param>
/// <returns>BindingSource</returns>
public static BindingSource GetBindingSource(this Control control)
{
if (control != null)
{
PropertyInfo _finded = control.GetType().GetProperty("DataSource");
if (_finded != null)
{
object _dbsource = _finded.GetValue(control, null);
if (_dbsource != null && _dbsource is BindingSource)
{
return _dbsource as BindingSource;
}
}
}
return null;
}
/// <summary>
/// 从BindingSource中条件移出
/// </summary>
/// <typeparam name="T">泛型</typeparam>
/// <param name="dbSource">BindingSource</param>
/// <param name="match">委托</param>
/// <returns>条件移出个数</returns>
public static int Remove<T>(this BindingSource dbSource, Predicate<T> match) where T : class
{
int _count = 0;
if (dbSource != null)
{
for (int i = 0; i < dbSource.List.Count; i++)
{
object _cur = dbSource.List[i];
if (match((T)_cur))
{
dbSource.List.Remove(_cur);
_count++;
i--;
}
}
}
return _count;
}
/// <summary>
/// 从BindingSource中条件查找
/// </summary>
/// <typeparam name="T">泛型</typeparam>
/// <param name="dbSource">BindingSource</param>
/// <param name="match">委托</param>
/// <returns>没有查找到则返回NULL</returns>
public static T Find<T>(this BindingSource dbSource, Predicate<T> match) where T : class
{
T _finded = null;
if (dbSource != null)
{
foreach (T t in dbSource.List)
{
if (match(t))
{
_finded = t;
break;
}
}
}
return _finded;
}
/// <summary>
/// 从BindingSource中条件查找集合
/// </summary>
/// <typeparam name="T">泛型</typeparam>
/// <param name="dbSource">BindingSource</param>
/// <param name="match">委托</param>
/// <returns>没有查找到则返回NULL</returns>
public static IList<T> FindAll<T>(this BindingSource dbSource, Predicate<T> match) where T : class
{
IList<T> _findedList = null;
if (dbSource != null)
{
_findedList = new List<T>();
foreach (T t in dbSource.List)
{
if (match(t))
{
_findedList.Add(t);
}
}
}
return _findedList;
}
}
}

测试代码如下：

using System;
using System.Collections.Generic;
using System.Windows.Forms;
using WinFormUtilHelpV2;
using WinFormUtilHelpV2Test.Models;
namespace WinFormUtilHelpV2Test
{
public partial class WinBindingSourceToolV2Test : Form
{
public WinBindingSourceToolV2Test()
{
InitializeComponent();
}
private void WinBindingSourceToolV2Test_Load(object sender, EventArgs e)
{
IList<Person> _source = new List<Person>();
for (int i = 0; i < 10; i++)
{
Person _entity = new Person();
_entity.Age = i;
_entity.Name = "YanZhiwei" + i;
_source.Add(_entity);
}
dataGridView1.SetBindingSource(_source);
}
private void button1_Click(object sender, EventArgs e)
{
Person _person = dataGridView1.GetBindingSource().Find<Person>(c => c.Age == 5);
MessageBox.Show("条件查找：" + _person != null ? "查找到一个." : "未查找到.");
}
private void button2_Click(object sender, EventArgs e)
{
int _count = dataGridView1.GetBindingSource().Remove<Person>(c => c.Age >= 5);
MessageBox.Show("成功移出：" + _count);
}
private void button3_Click(object sender, EventArgs e)
{
IList<Person> _personList = dataGridView1.GetBindingSource().FindAll<Person>(c => c.Age < 5);
MessageBox.Show("条件查找：" + _personList != null ? "查找到" + _personList.Count + "个" : "未查找到.");
}
}
}
/// <summary>
/// DataGridView SetBindingSource
/// </summary>
/// <typeparam name="T">IList</typeparam>
/// <param name="dataGrid">dataGrid</param>
/// <param name="source">泛型</param>
public static void SetBindingSource<T>(this DataGridView dataGrid, IList<T> source)
{
BindingList<T> _bindinglist = new BindingList<T>(source);
BindingSource _source = new BindingSource(_bindinglist, null);
dataGrid.DataSource = _source;
}

测试结果如下图所示：

希望本文所述实例对大家C#程序设计能有所帮助！

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标签： WinForm

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