ASP.NET-FineUI开发实践-3
1.参照模拟数据库分页通过缓存重写内存分页，优化页面响应速度
Grid的响应速度是硬伤，我写了个通用方法把所有数据放在缓存中模拟数据库分页，比自带的缓存分页快很多，这里贴上实体类的通用方法，DataTable的就不贴了可以参照官方的自己写。记住要加上grid_PageIndexChange事件和grid_Sort事件，这里就不写了
/// <summary>
/// 获取数据源
/// </summary>
/// <returns></returns>
private void GetData()
{
List<MsUser> lstUser = GetData();//数据库返回数据实体
ViewState["lstUserData"] = JsonConvert.SerializeObject(lstUser);
}
/// <summary>
/// 数据源绑定
/// </summary>
private void BindGridView()
{
string slstUserData = ViewState["lstUserData"].ToString();
BindGridView<MsUser>(slstUserData, ref grid);
}
/// <summary>
/// 绑定数据源
/// </summary>
/// <typeparam name="T">范数据</typeparam>
/// <param name="vDataNew">数据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;//获取页显示数
int pageIndex = g.PageIndex;//获取当前页数
int pi = Convert.ToInt32(Math.Ceiling(Convert.ToDouble(DataNew.Count) / Convert.ToDouble(g.PageSize)));
pageIndex = pageIndex + 1 > pi ? pi - 1 : pageIndex;//重新绑定时（如查询）要判断页数
if (pageIndex < 0)
{
pageIndex = 0;
}
try
{
Reverser<T> reverser = null;
string SortField = g.SortField;//获取排序字段
if (SortField == "")
{
SortField = g.Columns[1].SortField;//默认第二列为排序列
}
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);//截取数据
}
g.DataSource = DataNew;//绑定
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;
}
}
/*从网上下的实体类排序类*/
/// <summary>
/// 继承IComparer<T>接口，实现同一自定义类型 对象比较
/// </summary>
/// <typeparam name="T">T为泛用类型</typeparam>
public class Reverser<T> : IComparer<T>
{
private Type type = null;
private ReverserInfo info;
/**/
/// <summary>
/// 构造函数
/// </summary>
/// <param name="type">进行比较的类类型</param>
/// <param name="name">进行比较对象的属性名称</param>
/// <param name="direction">比较方向(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>
/// 构造函数
/// </summary>
/// <param name="className">进行比较的类名称</param>
/// <param name="name">进行比较对象的属性名称</param>
/// <param name="direction">比较方向(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>
/// 构造函数
/// </summary>
/// <param name="t">进行比较的类型的实例</param>
/// <param name="name">进行比较对象的属性名称</param>
/// <param name="direction">比较方向(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;
}
//必须！实现IComparer<T>的比较方法。
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);
}
//交换操作数
private void Swap(ref object x, ref object y)
{
object temp = null;
temp = x;
x = y;
y = temp;
}
}
/**/
/// <summary>
/// 对象比较时使用的信息类
/// </summary>
public struct ReverserInfo
{
/**/
/// <summary>
/// 比较的方向，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后台，rows的values是行的值，后台可以看到，通过列号找到数组的值，这个方法不是很保险但是聊胜于无
01.grid.Rows[rowindex].Values[grid.FindColumn(Columnid).ColumnIndex].ToString();
3.按钮至少选择一项的通用方法,OnClientClick+=累加。
/// <summary>
/// 至少选择一项
/// </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("至少选择一项！");
}
}
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
NoSelectionNull(Grid1, Button4, Button2, Button3, Button6);
}
}