databindinghelper.cs

个人信息的源代码

using System;
using System.Windows.Forms;
using System.Data;

namespace PublicUIComponent
{
	/// <summary>
	/// 用于帮助实现数据绑定控件的许多功能。
	/// </summary>
	public class DataBindingHelper
	{
		public DataBindingHelper()
		{
			//
			// TODO: 在此处添加构造函数逻辑
			//
		}

		//绑定管理器
		CurrencyManager _cm = null;
		//绑定控件容器
		Control _container = null;

		/// <summary>
		/// 返回CurrencyManager对象
		/// </summary>
		public CurrencyManager CM
		{
			get
			{
				return _cm;
			}
			set
			{
				_cm = value;
			}
		}
		/// <summary>
		/// 返回绑定管理器的位置
		/// </summary>
		public int CmPosition
		{
			get
			{
				if(_cm != null)
					return _cm.Position;
				else
					return -1;
			}
		}
		/// <summary>
		/// 返回绑定管理器的记录数
		/// </summary>
		public int CmCount
		{
			get
			{
				if(_cm != null)
					return _cm.Count;
				else
					return 0;
			}
		}
		/// <summary>
		/// 容器控件
		/// </summary>
		public Control Container
		{
			get
			{
				return _container;
			}
			set
			{
				_container = value;
			}
		}
		/// <summary>
		/// 设定绑定数据源
		/// </summary>
		/// <param name="dataSource">数据集</param>
		/// <param name="dataMember">数据表</param>
		public void SetDataSource(object dataSource,string dataMember)
		{
			if(_container == null)
			{
				MessageBox.Show("请先指定容器控件！","提示信息",MessageBoxButtons.OK,MessageBoxIcon.Information);
				return;
			}
			if(dataMember == null)
			{
				_cm = _container.BindingContext[dataSource] as CurrencyManager;
			}
			else
			{
				_cm = _container.BindingContext[dataSource,dataMember] as CurrencyManager;
			}
		}
		/// <summary>
		///	移动到首记录
		/// </summary>
		public void MoveFirst()
		{
			if(_cm == null || _cm.Count == 0)
				return;
			_cm.Position = 0;
		}
		/// <summary>
		/// 移动到上一条记录
		/// </summary>
		public void MovePrev()
		{
			if(_cm == null || _cm.Count == 0)
				return;
			if(_cm.Position > 0)
				_cm.Position -= 1;
		}
		/// <summary>
		/// 移动到下一条记录
		/// </summary>
		public void MoveNext()
		{
			if(_cm == null || _cm.Count == 0)
				return;
			if(_cm.Position < _cm.Count-1)
				_cm.Position += 1;
		}
		/// <summary>
		/// 移动到尾记录
		/// </summary>
		public void MoveLast()
		{
			if(_cm == null || _cm.Count == 0)
				return;
			_cm.Position = _cm.Count-1;
		}
		/// <summary>
		/// 移动到指定的位置
		/// </summary>
		/// <param name="iRow"></param>
		public void MoveToPosition(int iRow)
		{
			if(_cm == null || _cm.Count == 0 || iRow >= _cm.Count || iRow < -1)
				return;
			_cm.Position = iRow;
		}
		/// <summary>
		/// 取出当前数据源当前行指定字段的值,注意,主要针对DataTable
		/// </summary>
		/// <param name="FieldName"></param>
		/// <returns></returns>
		public object GetDataTableFieldValue(string FieldName)
		{
			if(_cm == null || _cm.Count == 0 || _cm.Current == null)
				return null;
			object retObj = ((DataRowView)_cm.Current)[FieldName];
			return retObj;
		}
		/// <summary>
		/// 删除当前行
		/// </summary>
		public void DeleteCurrentDataRow()
		{
			if(_cm == null || _cm.Count == 0)
				return;
			if(_cm.Position != -1 
				&& MessageBox.Show("您真的要删除当前这条记录吗？","提示信息",MessageBoxButtons.OKCancel,MessageBoxIcon.Question) == DialogResult.OK)
				_cm.RemoveAt(_cm.Position);
		}
		/// <summary>
		/// 获取当前数据行
		/// </summary>
		/// <returns></returns>
		public DataRow GetCurrentDataRow()
		{
			if(_cm == null || _cm.Count == 0 || _cm.Current == null)
				return null;
			return ((DataRowView)_cm.Current).Row;
		}
		/// <summary>
		/// 获取指定序号（即第几行，从0起）的DataRow
		/// </summary>
		/// <param name="iRow"></param>
		/// <returns></returns>
		public DataRow GetDataRowFromRowIndex(int iRow)
		{
			if(_cm == null || _cm.Count == 0)
				return null;
			if(iRow <= -1 || iRow >= _cm.Count)
				return null;
			return ((DataRowView)_cm.List[iRow]).Row;
		}
	}
}