ASP. net mvc Practice Series 6-Grid implementation (I)

ASP. net mvc does not recommend the use of webform controls, that is, when you want the list to display data, you cannot use the GridView, many open source software is ASP. net mvc implements a list of solutions. The specific solutions are put in the next section. Here we will introduce some simple implementation methods.

1. Simple List Implementation

See ASP. net mvc practice series 2-simple applications

2. List sorting implementation:

View code:

Code
<Table>
<Tr>
<Th>
ID
</Th>
<Th>
<% = Html. ActionLink ("Author", "SortDemo", new {desc = Convert. ToBoolean (ViewData ["desc"]), sortName = "Author"}) %>
</Th>
<Th>
Title
</Th>
<Th>
CreateTime
</Th>
</Tr>
<% Foreach (var item in Model)
{%>
<Tr>
<Td>
<% = Html. Encode (item. ID) %>
</Td>
<Td>
<% = Html. Encode (item. Author) %>
</Td>
<Td>
<% = Html. Encode (item. Title) %>
</Td>
<Td>
<% = Html. Encode (String. Format ("{0: g}", item. CreateTime) %>
</Td>
</Tr>
<% }%>
</Table>
<% = Html. actionLink ("author", "SortDemo", new {desc = Convert. toBoolean (ViewData ["desc"]), sortName = "Author"}) %> the html output to the page is: http: // localhost: 4598 /? Desc = False & sortName = Author

Controller:

Code
Public ActionResult SortDemo (bool? Desc, string sortName)
{

List <News> list = ListNews. GetList ();
ParameterExpression p = Expression. Parameter (typeof (News), "p ");
MemberExpression expM;
System. Reflection. PropertyInfo propertyInfo;
If (string. IsNullOrEmpty (sortName ))
{
PropertyInfo = typeof (News). GetProperty ("ID ");
}
Else
{
PropertyInfo = typeof (News). GetProperty (sortName );

}
ExpM = Expression. MakeMemberAccess (p, propertyInfo );
Expression exp = Expression. Lambda (expM, p );
If (desc = null | desc = false)
{
ViewData ["desc"] = true;
Return View (list. AsQueryable <News> (). OrderBy (exp, true, propertyInfo. PropertyType ));
}
Else
{
ViewData ["desc"] = false;
Return View (list. AsQueryable <News> (). OrderBy (exp, false, propertyInfo. PropertyType ));
}
}
The following code also needs to be available in the namespace visible to the Controller:

Code
Public static class Dynamic
{

Public static IQueryable OrderBy (this IQueryable source, Expression ordering, bool desc, Type returnType)
{
Expression queryExpr = source. Expression;
QueryExpr = Expression. Call (typeof (Queryable), desc? "OrderBy": "OrderByDescending ",
New Type [] {source. ElementType, returnType },
QueryExpr, Expression. Quote (ordering ));
Return source. Provider. CreateQuery (queryExpr );
}
}

The above code is used to dynamically splice the OrderBy expression. Of course, we can also use the Dynamic class provided by Microsoft, this Dynamic class can be found in the LinqSamples/DynamicQuery folder in the \ Microsoft Visual Studio 9.0 \ Samples \ 2052 \ CSharpSamples.zip file.

3. List page flip:

View:

Code
<Table>
<Tr>
<Th>
ID
</Th>
<Th>
Author
</Th>
<Th>
Title
</Th>
<Th>
CreateTime
</Th>
</Tr>
<% Foreach (var item in Model)
{%>
<Tr>
<Td>
<% = Html. Encode (item. ID) %>
</Td>
<Td>
<% = Html. Encode (item. Author) %>
</Td>
<Td>
<% = Html. Encode (item. Title) %>
</Td>
<Td>
<% = Html. Encode (String. Format ("{0: g}", item. CreateTime) %>
</Td>
</Tr>
<% }%>
<Tr>
<Td colspan = "4" align = "right">
<%
Var currentPage = (int) ViewData ["currentPage"];
Var pages = (int) ViewData ["pages"];
For (int I = 0; I <pages; I ++)
{
If (currentPage = I)
{
%>
& Lt; % = I + 1% & gt;
<%
}
Else
{
%>
<% = Html. ActionLink (I + 1). ToString (), "NewsPageList", new {page = I}) %>
<%
}
%>
<%}
%>
</Td>
</Tr>
</Table>

Controller:

Code
Public ActionResult NewsPageList (int? Page)
{
List <News> list = ListNews. GetList ();
Const int pageSize = 5;
ViewData ["currentPage"] = page ?? 0;
ViewData ["pages"] = Convert. ToInt32 (Math. Ceiling (double) list. Count ()/pageSize ));

Var news = list. Skip (page ?? 0) * pageSize). Take (pageSize );
Return View (news );
}

4. Download source code

5. Reference:

Microsoft Dynamic

Article from: http://www.cnblogs.com/nuaalfm/