页面无限跳转间如何保存页面状态(2)

解决方法的实现

       以上分析过了之后，我们来看如何实现他：

       class DataInfo：这个类用于保存数据状态，一般而言，也就是每个DataGrid对应一个：

[Serializable()]

     public class DataInfo

     {

         private string dataName;

         private Hashtable searchParams;

         private Hashtable otherParams;

         private int currentPage;

         private string sortExpression;

         private string itemID;

 

         public DataInfo(string dataName)

         {

              this.dataName = dataName;

         }

 

         /// <summary>

         /// 数据名

         /// </summary>

         public string DataName

         {

              get { return dataName; }

         }

         /// <summary>

         /// 查询参数

         /// </summary>

         public Hashtable SearchParams

         {

              get { return searchParams; }

              set { searchParams = value; }

         }

 

         /// <summary>

         /// 获取其他参数

         /// </summary>

         public Hashtable OtherParams

         {

              get { return otherParams; }

              set { otherParams = value; }

         }

 

         /// <summary>

         /// 获取当前页

         /// </summary>

         public int CurrentPage

         {

              get { return currentPage; }

              set { currentPage = value; }

         }

 

         /// <summary>

         ///获取排序方式

         /// </summary>

         public string SortExpression

         {

              get { return sortExpression ;}

              set { sortExpression = value; }

         }

 

         /// <summary>

         /// 获取要显示在当前页的项的ID

         /// </summary>

         public string ItemID

         {

              get { return itemID; }

              set { itemID = value; }

         }

     }

 

class DataInfoList：这个类包装承载DataInfo的动态数组，限定数组输入输出的数据类型

[Serializable()]

     public class DataInfoList

     {

         private ArrayList dataInfoList = new ArrayList();

 

         public DataInfo this[int index]

         {

              get

              {

                   return (DataInfo)dataInfoList[index];

              }

              set

              {

                   if (((DataInfo)dataInfoList[index]).DataName == value.DataName || this[value.DataName] == null)

                   {

                       dataInfoList[index] = value;

                   }

                   else

                   {

                       throw new Exception("There have a DataInfo used this Name yet!");

                   }

              }

         }

 

         public DataInfo this[string dataName]

         {

              get

              {

                   for (int i = 0; i < dataInfoList.Count; i++)

                   {

                       if (this[i].DataName == dataName)

                       {

                            return this[i];

                       }

                   }

                   return null;

              }

              set

              {

                   for (int i = 0; i < dataInfoList.Count; i++)

                   {

                       if (this[i].DataName == dataName)

                       {

                            this[i] = value;

                            return;

                       }

                   }

                   this.Add(value);

              }

         }

 

         public void Remove(DataInfo value)

         {

              dataInfoList.Remove(value);

         }

 

         public void Remove(string dataName)

         {

              DataInfo dataInfo = this[dataName];

              if (dataInfo != null)

              {

                   dataInfoList.Remove(dataInfo);

              }

         }

 

         public bool Contains(DataInfo value)

         {

              return dataInfoList.Contains(value);

         }

 

         public bool Contains(string dataName)

         {

              DataInfo datainfo = this[dataName];

              if (datainfo != null)

              {

                   return true;

              }

              return false;

         }

 

         public void Clear()

         {

              dataInfoList.Clear();

         }

 

         public int Add(DataInfo value)

         {

              if (this[value.DataName] == null)

              {

                   return dataInfoList.Add(value);

              }

              else

              {

                   throw new Exception("There have a DataInfo used this Name yet!");

              }

         }

 

         public int Count

         {

              get

              {

                   return dataInfoList.Count;

              }

         }

     }

 

interface IPageInfo：这个接口用在页面中，以实现页面间的数据通信。

public interface IPageInfo

     {

         /// <summary>

         /// 页面名

         /// </summary>

         string PageName

         {

              get;

         }

         /// <summary>

         /// 获取数据信息

         /// </summary>

         DataInfoList DataInfos

         {

              get;

         }

        

         /// <summary>

         /// 获取其他参数

         /// </summary>

         Hashtable OtherParams

         {

              get;

         }

     }

 

（未完待续）