最近项目View层越来越趋向于无刷新化，特别是数据展示方面，还要对Linq有很好的支持.
在WebFrom模式的开发中，GridView是一个功能很强大，很常用的控件，但是他也不是完美的,没有自带的无刷新和排序（有人说UpdatePanel或第三方插件就可以实现无刷新，呵呵... 相信不少朋友和我一样讨厌UpdatePanel,
引入一大堆很长的js库且不说，用起来感觉不到一点无刷新带来的快速），也不支持部分数据绑定分页(有人说部分数据绑定也可以用aspNetPager等第三方插件很好的实现,但是那个插件能在一个事件里搞定分页和排序吗，还是无刷新的)，
我也网上找了很多，但都不是很好用，很多还不提供源代码，所以自己实现了一个
具体功能如下：
1.由于是扩展实现.net中自带的GridView 所以GridView的功能她都有
2.支持部分数据绑定，节约服务器资源(即DataSource只需指定当前要显示页的数据，而不需要像自带的GridView一样DataSource为整个数据源)
3.无刷新分页，可自定义分页栏，分页按钮样式
4.无刷新排序，可自定义排序栏，排序按钮的样式
5.自定义无刷新操作后的视图状态[ViewState]（1.禁用视图状态 2.只维护数据的视图状态 3.维护全部数据和子控件的视图状态)
6.简化事件处理，排序和分页只需一个事件
下载地址：https://files.cnblogs.com/dint/TComponentsTest_V_1_0_3.rar
不同数据源的绑定:
DataTable:
private void BindSource()
{
DataTable dtPersons = new DataTable();
dtPersons.Columns.Add("Name");
dtPersons.Columns.Add("Age");
dtPersons.Columns.Add("Address");
dtPersons.Columns.Add("Sex");
for (int i = 1, il = 5000; i <= il; i++)
{
DataRow nrow = dtPersons.NewRow();
nrow[0] = "Name" + i.ToString();
nrow[1] = "Age" + i.ToString();
nrow[2] = "Address" + i.ToString();
nrow[3] = "Sex" + i.ToString();
dtPersons.Rows.Add(nrow);
}
TwfGridView1.DataSource = dtPersons;
TwfGridView1.DataBind();
}
List,Linq:
private void BindSource()
{
List<Person> lstPersons = new List<Person>();
for (int i = 1, il = 2000; i <= il; i++)
{
Person p = new Person()
{
Id=i,
Name = "Name" + i.ToString(),
Age = "Age" + i.ToString(),
Address = "Address" + i.ToString(),
Sex = "Sex" + i.ToString()
};
lstPersons.Add(p);
}
TwfGridView1.DataSource = lstPersons;
TwfGridView1.DataBind();
}
分页排序事件，部分数据源(EntityFramework数据操作,其他的类似)：
//部分数据源绑定需调用,重载的DataBind(int pageIndex,int allRecordCount)方法
private void DataBinder(int pageindex, string sortexp, SortDirection? direct)
{
using (var db = new EFDbContext(@"Data Source=.;Initial Catalog=dbtest;Integrated Security=true;"))
{
var results = db.Persons.Where(x => x.Id < 500);
int rc = results.Count();
int ps = (rc % TwfGridView1.PageSize == 0) ? rc / TwfGridView1.PageSize : rc / TwfGridView1.PageSize + 1;
if (pageindex > ps - 1) pageindex = ps - 1;
var v= results;
if (sortexp == "Id")
{
if (direct == SortDirection.Descending)
{
v = v.OrderByDescending(x => x.Id);
}
else
{
v = v.OrderBy(x => x.Id);
}
}
else if (sortexp == "Name")
{
if (direct == SortDirection.Descending)
{
v = v.OrderByDescending(x => x.Name);
}
else
{
v = v.OrderBy(x => x.Name);
}
}
else if (sortexp == "Age")
{
if (direct == SortDirection.Descending)
{
v = v.OrderByDescending(x => x.Age);
}
else
{
v = v.OrderBy(x => x.Age);
}
}
else if (sortexp == "Sex")
{
if (direct == SortDirection.Descending)
{
v = v.OrderByDescending(x => x.Sex);
}
else
{
v = v.OrderBy(x => x.Id);
}
}
else if (sortexp == "Address")
{
if (direct == SortDirection.Descending)
{
v = v.OrderByDescending(x => x.Address);
}
else
{
v = v.OrderBy(x => x.Address);
}
}
else { v = v.OrderBy(x => x.Id); }
v = v.Skip(pageindex * TwfGridView1.PageSize).Take(TwfGridView1.PageSize);
TwfGridView1.DataSource =v.ToList();
TwfGridView1.DataBind(pageindex, rc);//注意重载了DataBind方法
}
}
protected void TwfGridView1_PageSorting(object sender, GridViewPageEventArgs ePage, Dint.TwfWebox.EGridViewSortArgs eSort)
{
DataBinder(ePage.NewPageIndex, eSort.SortExpression, eSort.SortDirection);
}
1 <cc1:TwfGridView ID="TwfGridView1" runat="server" 2 onpagesorting="TwfGridView1_PageSorting" AjaxViewState="False" 3 AllowPaging="True" AllowSorting="True" FocusBgColor="" jQuerySupport="True" 4 LoadMsg="正在加载数据..."> 5 <EPagerSetting NavButton="PrevNumNext" ClassName="TwfGv_All" NavMessageBarCss="TwfGv_NavMessage" 6 NumBtnBarCss="TwfGv_NumBtnBar" CurrentNumBtnCss="TwfGv_CurrNumBtn" PrevNextBtnCss="TwfGv_PrevNextBtn" 7 DisabledPrevNextBtnCss="TwfGv_PrevNextDisable" PagerInfoFormatter="<每页 {RecordCount} 条 共 {TotalCount} 条 当前第 {PageIndex}/{PageCount} 页>" 8 GoToBarEnable="True" GotoBtnText="转到" GoToDropdown="DropdownSubmit" 9 GotoClassName="TwfGv_Goto" GotoTxtCss="TwfGv_Goto_Txt"></EPagerSetting> 10 <ESortSetting SortAscCss="TwfGv_SortAsc" SortDescCss="TwfGv_SortDesc" SortDefaultCss="TwfGv_SortDef" 11 AscFormatter="{0}↑" DescFormatter="{0}↓"></ESortSetting> 12 <PagerSettings FirstPageText="首页" LastPageText="末页" NextPageText="下一页" PreviousPageText="上一页"></PagerSettings> 13 </cc1:TwfGridView>
快捷设计时:
分页排序效果:
当前焦点行颜色效果:
下拉页选择效果:
具体实现原理：
1.重写DataSource属性 适应不同数据源
1 /// <summary> 2 /// 获取或设置数据源 支持 DataTable,DataView,ICollection,ITwfRecordCount,IQueryable 等类型的数据源 3 /// </summary> 4 public override object DataSource 5 { 6 get 7 { 8 return base.DataSource; 9 } 10 set 11 { 12 IListSource dtSource = value as IListSource; 13 if (dtSource != null){ 14 _RecordCount = dtSource.GetList().Count; 15 } 16 else{ 17 ITwfRecordCount trcSource = value as ITwfRecordCount; 18 if (trcSource != null){ 19 _RecordCount = trcSource.RecordCount(); 20 } 21 else{ 22 ICollection cletSource = value as ICollection; 23 if (cletSource != null){ 24 _RecordCount = cletSource.Count; 25 } 26 else{ 27 IEnumerable aEnum = value as IEnumerable; 28 if (aEnum != null) { 29 IEnumerator aEnumtor = aEnum.GetEnumerator(); 30 if (aEnumtor != null) 31 { 32 int iCount = 0; 33 aEnumtor.Reset(); 34 while (aEnumtor.MoveNext())iCount++; 35 _RecordCount = iCount; 36 } 37 } 38 } 39 } 40 } 41 VsRecordCount = _RecordCount; 42 base.DataSource = value; 43 } 44 }
2.重写控件呈现函数 呈现的时候传递分页参数
1 private void RenderHtml(HtmlTextWriter defWriter) 2 { 3 if (Page != null) 4 { 5 Page.VerifyRenderingInServerForm(this); 6 StringBuilder strBuilder = new StringBuilder(2048); 7 StringWriter strWriter = new StringWriter(strBuilder); 8 HtmlTextWriter htmlWriter = new HtmlTextWriter(strWriter); 9 base.RenderChildren(htmlWriter); 10 string strVs="",strEvl=""; 11 TransferFormState(ref strVs, ref strEvl); 12 RspCallBackResult(string.Format("SUCCE{0},{1},{2},{3}~{4},{5},{6}~{8}~{9}~{7}", PageIndex.ToString().PadLeft(4, '0'), 13 PageCount.ToString().PadLeft(4, '0'), "0000", "0000",aSort.ColumnIndex.ToString(), 14 aSort.SortExpression,aSort.DirectString,strBuilder.ToString(),strVs,strEvl)); 15 } 16 else{ 17 base.RenderChildren(defWriter); 18 } 19 }
3.处理ViewState让无刷新之后也能保存视图状态（此处用 IL 实现效率会更高）
1 private void TransferFormState(ref string rVstate,ref string rEvl) 2 { 3 if (_AjaxViewState && isVsSupport) 4 { 5 MethodInfo ptrM = Page.GetType().GetMethod("DecomposeViewStateIntoChunks", 6 BindingFlags.Instance | BindingFlags.NonPublic); 7 ICollection ivs = ptrM.Invoke(Page, null) as ICollection; 8 if ((ivs != null) && (ivs.Count > 0)) 9 { 10 StringBuilder strBuilder = new StringBuilder(1024); 11 int num = 0, ivc = ivs.Count - 1; 12 foreach (string s in ivs) 13 { 14 strBuilder.Append(s); 15 if (num < ivc) strBuilder.Append("#"); 16 num++; 17 } 18 rVstate = strBuilder.ToString(); 19 } 20 if (Page.EnableEventValidation) 21 { 22 ptrM = Page.ClientScript.GetType().GetMethod("GetEventValidationFieldValue", 23 BindingFlags.Instance | BindingFlags.NonPublic); 24 rEvl = ((ptrM.Invoke(Page.ClientScript, null) as string) ?? ""); 25 } 26 } 27 }
4.更友好的设计时支持 让控件更易用
1 public class TwfGridDesignerActionList : DesignerActionList 2 { 3 private TwfGridView twfGridView; 4 public TwfGridDesignerActionList(IComponent component) : base(component) { 5 twfGridView = component as TwfGridView; 6 7 } 8 private void SetProperty(string propertyName, object value) 9 { 10 TypeDescriptor.GetProperties(twfGridView)[propertyName].SetValue(twfGridView, value); 11 } 12 public override DesignerActionItemCollection GetSortedActionItems() 13 { 14 DesignerActionItemCollection nitem = new DesignerActionItemCollection(); 15 nitem.Add(new DesignerActionHeaderItem("扩展分页/排序", "kzfypx")); 16 nitem.Add(new DesignerActionPropertyItem("AllowPaging", "允许分页", "kzfypx")); 17 nitem.Add(new DesignerActionPropertyItem("AllowSorting", "允许排序", "kzfypx")); 18 nitem.Add(new DesignerActionPropertyItem("GotoEnable", "启用'转到'按钮", "kzfypx")); 19 nitem.Add(new DesignerActionPropertyItem("StateMode", "视图状态", "kzfypx", "Part:部分状态\r\nNone:无状态\r\nAll:完全状态")); 20 nitem.Add(new DesignerActionMethodItem(this, "About", "关于 TwfGridView ...", "kzfypx",true)); 21 return nitem; 22 } 23 [EditorBrowsable(EditorBrowsableState.Never)] 24 public bool GotoEnable 25 { 26 get{ 27 return this.twfGridView.EPagerSetting.GoToBarEnable; 28 } 29 set 30 { 31 TypeDescriptor.GetProperties(twfGridView.EPagerSetting)["GoToBarEnable"].SetValue(twfGridView.EPagerSetting,value); 32 AllowPaging = AllowPaging; 33 } 34 35 } 36 [EditorBrowsable(EditorBrowsableState.Never)] 37 public void About() 38 { 39 (new FrmAbout()).ShowDialog(); 40 } 41 [EditorBrowsable(EditorBrowsableState.Never)] 42 public bool AllowSorting { 43 get { return this.twfGridView.AllowSorting; } 44 set { SetProperty("AllowSorting", value); } 45 } 46 [EditorBrowsable(EditorBrowsableState.Never)] 47 public bool AllowPaging 48 { 49 get { return this.twfGridView.AllowPaging; } 50 set { SetProperty("AllowPaging", value); } 51 } 52 [EditorBrowsable(EditorBrowsableState.Never)] 53 public TwfGridViewStateMode StateMode 54 { 55 get { 56 if (!this.twfGridView.EnableViewState) return TwfGridViewStateMode.None; 57 if (!this.twfGridView.AjaxViewState) return TwfGridViewStateMode.Part; 58 return TwfGridViewStateMode.All; 59 } 60 set { 61 switch (value) 62 { 63 case TwfGridViewStateMode.None: 64 SetProperty("EnableViewState", false); 65 SetProperty("AjaxViewState", false); 66 break; 67 case TwfGridViewStateMode.Part: 68 SetProperty("EnableViewState", true); 69 SetProperty("AjaxViewState", false); 70 break; 71 case TwfGridViewStateMode.All: 72 SetProperty("EnableViewState", true); 73 SetProperty("AjaxViewState", true); 74 break; 75 default: 76 throw new Exception("error param"); 77 78 } 79 } 80 } 81 }