1.參照模拟資料庫分頁通過緩存重寫記憶體分頁,優化頁面響應速度
Grid的響應速度是硬傷,我寫了個通用方法把所有資料放在緩存中模拟資料庫分頁,比自帶的緩存分頁快很多,這裡貼上實體類的通用方法,DataTable的就不貼了可以參照官方的自己寫。記住要加上grid_PageIndexChange事件和grid_Sort事件,這裡就不寫了
/// <summary>
/// 擷取資料源
/// </summary>
/// <returns></returns>
private void GetData()
{
List<MsUser> lstUser = GetData();//資料庫傳回資料實體
ViewState["lstUserData"] = JsonConvert.SerializeObject(lstUser);
}
/// <summary>
/// 資料源綁定
/// </summary>
private void BindGridView()
{
string slstUserData = ViewState["lstUserData"].ToString();
BindGridView<MsUser>(slstUserData, ref grid);
}
/// <summary>
/// 綁定資料源
/// </summary>
/// <typeparam name="T">範資料</typeparam>
/// <param name="vDataNew">資料Json</param>
/// <param name="g">grid</param>
public static void BindGridView<T>(string vDataNew, ref Grid g)
{
List<T> DataNew = (List<T>)JsonConvert.DeserializeObject(vDataNew, typeof(List<T>));
g.RecordCount = DataNew.Count;
int pageSize = g.PageSize;//擷取頁顯示數
int pageIndex = g.PageIndex;//擷取目前頁數
int pi = Convert.ToInt32(Math.Ceiling(Convert.ToDouble(DataNew.Count) / Convert.ToDouble(g.PageSize)));
pageIndex = pageIndex + 1 > pi ? pi - 1 : pageIndex;//重新綁定時(如查詢)要判斷頁數
if (pageIndex < 0)
{
pageIndex = 0;
}
try
{
Reverser<T> reverser = null;
string SortField = g.SortField;//擷取排序字段
if (SortField == "")
{
SortField = g.Columns[1].SortField;//預設第二列為排序列
}
reverser = new Reverser<T>(DataNew[0].GetType(), SortField, g.SortDirection == "ASC" ? ReverserInfo.Direction.ASC : ReverserInfo.Direction.DESC);//排序方法
DataNew.Sort(reverser);
if (pageSize <= DataNew.Count)
{
int pz = pageSize < DataNew.Count - pageIndex * pageSize ? pageSize : DataNew.Count - pageIndex * pageSize;
if (pageSize == DataNew.Count)
{
pz = pageSize;
}
DataNew = DataNew.GetRange((pageIndex) * pageSize, pz);//截取資料
}
g.DataSource = DataNew;//綁定
g.DataBind();
}
catch (Exception ex)
{
//Response.Write(ex.Message);
g.DataSource = null;
g.DataBind();
}
g.PageIndex = g.PageIndex + 1 > g.PageCount ? g.PageCount - 1 : g.PageIndex;
if (g.PageIndex < 0)
{
g.PageIndex = 0;
}
}
/*從網上下的實體類排序類*/
/// <summary>
/// 繼承IComparer<T>接口,實作同一自定義類型 對象比較
/// </summary>
/// <typeparam name="T">T為泛用類型</typeparam>
public class Reverser<T> : IComparer<T>
{
private Type type = null;
private ReverserInfo info;
/**/
/// <summary>
/// 構造函數
/// </summary>
/// <param name="type">進行比較的類類型</param>
/// <param name="name">進行比較對象的屬性名稱</param>
/// <param name="direction">比較方向(升序/降序)</param>
public Reverser(Type type, string name, ReverserInfo.Direction direction)
{
this.type = type;
this.info.name = name;
if (direction != ReverserInfo.Direction.ASC)
this.info.direction = direction;
}
/**/
/// <summary>
/// 構造函數
/// </summary>
/// <param name="className">進行比較的類名稱</param>
/// <param name="name">進行比較對象的屬性名稱</param>
/// <param name="direction">比較方向(升序/降序)</param>
public Reverser(string className, string name, ReverserInfo.Direction direction)
{
try
{
this.type = Type.GetType(className, true);
this.info.name = name;
this.info.direction = direction;
}
catch (Exception e)
{
throw new Exception(e.Message);
}
}
/**/
/// <summary>
/// 構造函數
/// </summary>
/// <param name="t">進行比較的類型的執行個體</param>
/// <param name="name">進行比較對象的屬性名稱</param>
/// <param name="direction">比較方向(升序/降序)</param>
public Reverser(T t, string name, ReverserInfo.Direction direction)
{
this.type = t.GetType();
this.info.name = name;
this.info.direction = direction;
}
//必須!實作IComparer<T>的比較方法。
int IComparer<T>.Compare(T t1, T t2)
{
object x = this.type.InvokeMember(this.info.name, BindingFlags.Public | BindingFlags.Instance | BindingFlags.GetProperty, null, t1, null);
object y = this.type.InvokeMember(this.info.name, BindingFlags.Public | BindingFlags.Instance | BindingFlags.GetProperty, null, t2, null);
if (this.info.direction != ReverserInfo.Direction.ASC)
Swap(ref x, ref y);
return (new CaseInsensitiveComparer()).Compare(x, y);
}
//交換操作數
private void Swap(ref object x, ref object y)
{
object temp = null;
temp = x;
x = y;
y = temp;
}
}
/**/
/// <summary>
/// 對象比較時使用的資訊類
/// </summary>
public struct ReverserInfo
{
/**/
/// <summary>
/// 比較的方向,如下:
/// ASC:升序
/// DESC:降序
/// </summary>
public enum Direction
{
ASC = 0,
DESC,
};
public enum Target
{
CUSTOMER = 0,
FORM,
FIELD,
SERVER,
};
public string name;
public Direction direction;
public Target target;
}
2.得到指定行指定列的值背景,rows的values是行的值,背景可以看到,通過列号找到數組的值,這個方法不是很保險但是聊勝于無
01.grid.Rows[rowindex].Values[grid.FindColumn(Columnid).ColumnIndex].ToString();
3.按鈕至少選擇一項的通用方法,OnClientClick+=累加。
/// <summary>
/// 至少選擇一項
/// </summary>
/// <param name="g"></param>
/// <param name="ctrls"></param>
private void NoSelectionNull(Grid g, params FineUI.Button[] ctrls)
{
foreach (FineUI.Button ctrl in ctrls)
{
ctrl.OnClientClick += g.GetNoSelectionAlertReference("至少選擇一項!");
}
}
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
NoSelectionNull(Grid1, Button4, Button2, Button3, Button6);
}
}