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灵活掌握Asp.net MVC中GridView的使用方法

转载 作者:qq735679552 更新时间:2022-09-29 22:32:09 25 4
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本文教程为大家分享了GridView控件的使用方法和具体实现代码,供大家参考,具体内容如下 。

Models文件下实体类

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public class Customer
{
public int Id { get ; set ; }
public string CompanyName { get ; set ; }
public string ContactTitle { get ; set ; }
public string Address { get ; set ; }
public string City { get ; set ; } 
public string Country { get ; set ; }
public string Phone { get ; set ; }
public DateTime Founded { get ; set ; }
}

  。

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public class CustomersViewModel
 
{
public IQueryable<Customer> Customers { get ; set ; }
 
public PagingInfo PagingInfo { get ; set ; }
 
public string JsonPagingInfo { get ; set ; }
}
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public static class ExpresssionBuilder
{
private static readonly MethodInfo containsMethod = typeof ( string ).GetMethod( "Contains" );
private static readonly MethodInfo startsWithMethod = typeof ( string ).GetMethod( "StartsWith" , new Type[] { typeof ( string ) });
private static readonly MethodInfo endsWithMethod = typeof ( string ).GetMethod( "EndsWith" , new Type[] { typeof ( string ) });
 
 
public static Expression<Func<T, bool >> GetExpression<T>(IList<FilterObject> filters)
{
  if (filters.Count == 0)
  return null ;
 
  ParameterExpression param = Expression.Parameter( typeof (T), "t" );
  Expression exp = null ;
 
  if (filters.Count == 1)
  exp = GetExpression<T>(param, filters[0]);
  else if (filters.Count == 2)
  exp = GetExpression<T>(param, filters[0], filters[1]);
  else
  {
  while (filters.Count > 0)
  {
   var f1 = filters[0];
   var f2 = filters[1];
 
   if (exp == null )
   exp = GetExpression<T>(param, filters[0], filters[1]);
   else
   exp = Expression.AndAlso(exp, GetExpression<T>(param, filters[0], filters[1]));
 
   filters.Remove(f1);
   filters.Remove(f2);
 
   if (filters.Count == 1)
   {
   exp = Expression.AndAlso(exp, GetExpression<T>(param, filters[0]));
   filters.RemoveAt(0);
   }
  }
  }
 
  return Expression.Lambda<Func<T, bool >>(exp, param);
}
 
private static Expression GetExpression<T>(ParameterExpression param, FilterObject filter)
{
  MemberExpression member = Expression.Property(param, filter.Column);
  //ConstantExpression constant = Expression.Constant(filter.Value);
 
  //新的逻辑来处理可空Decimal和DateTime值
  UnaryExpression constant = null ;
  if (member.Type == typeof (Decimal?))
  {
  constant = Expression.Convert(Expression.Constant(Decimal.Parse(filter.Value)) , member.Type);
  }
  else if (member.Type == typeof (DateTime?))
  {
  constant = Expression.Convert(Expression.Constant(DateTime.Parse(filter.Value)), member.Type);
  }
  else
  {
  constant = Expression.Convert(Expression.Constant(filter.Value), member.Type);
  }
 
 
  switch (filter.Operator)
  {
  case FilterOperator.Equals:
   return Expression.Equal(member, constant);
 
  case FilterOperator.GreaterThan:
   return Expression.GreaterThan(member, constant);
 
  case FilterOperator.GreaterThanOrEqual:
   return Expression.GreaterThanOrEqual(member, constant);
 
  case FilterOperator.LessThan:
   return Expression.LessThan(member, constant);
 
  case FilterOperator.LessThanOrEqual:
   return Expression.LessThanOrEqual(member, constant);
 
  case FilterOperator.Contains:
   return Expression.Call(member, containsMethod, constant);
 
  case FilterOperator.StartsWith:
   return Expression.Call(member, startsWithMethod, constant);
 
  case FilterOperator.EndsWith:
   return Expression.Call(member, endsWithMethod, constant);
 
  case FilterOperator.NotEqual:
   return Expression.Negate(Expression.Equal(member, constant));
  }
 
  return null ;
}
 
private static BinaryExpression GetExpression<T> (ParameterExpression param, FilterObject filter1, FilterObject filter2)
{
  Expression bin1 = GetExpression<T>(param, filter1);
  Expression bin2 = GetExpression<T>(param, filter2);
 
  return Expression.AndAlso(bin1, bin2);
}
}

  。

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public class PagingInfo
{
public List< int > PageOptions { get ; set ; }
 
public bool ShowPageOptions { get ; set ; }
 
public int TotalItems { get ; set ; }
public int ItemsPerPage { get ; set ; }
public int CurrentPage { get ; set ; }
 
public int TotalPages
{
  get { return ( int )Math.Ceiling(( decimal )TotalItems / (ItemsPerPage != 0 ? ItemsPerPage : 1)); }
}
 
public SortObject Sort { get ; set ; }
 
public IList<FilterObject> Filters { get ; set ; }
 
public string SearchTerm { get ; set ; }
}
 
public class SortObject
{
public String SortColumn { get ; set ; }
 
public SortDirection Direction { get ; set ; }
}
 
public class FilterObject
{
public string Column { get ; set ; }
 
public string Value { get ; set ; }
 
public FilterOperator Operator { get ; set ; }
 
public FilterConjunction Conjunction { get ; set ; }
}
 
 
/********* ENUMS *************/
public enum SortDirection
{
NotSet,
Ascending,
Descending
}
 
public enum FilterOperator
{
Contains,
GreaterThan,
GreaterThanOrEqual,
LessThan,
LessThanOrEqual,
StartsWith,
EndsWith,
Equals,
NotEqual
}
 
public enum FilterConjunction
{
And,
Or
}
 
public class Extensions
{
public static string GetWhereClause(FilterObject filterObj, Type valueType)
  string whereClause = "true" ;
  if (valueType != typeof (DateTime))
  {
  switch (filterObj.Operator)
  {
   case FilterOperator.Contains:
   if (valueType == typeof ( string ))
    whereClause += string .Format( " {0} {1}.Contains(\"{2}\")" , filterObj.Conjunction,
    filterObj.Column, filterObj.Value);
   break ;
   case FilterOperator.GreaterThan:
   if (valueType != typeof ( string ))
    whereClause += string .Format( " {0} {1} > {2}" , filterObj.Conjunction, filterObj.Column,
    filterObj.Value);
   break ;
   case FilterOperator.GreaterThanOrEqual:
   if (valueType != typeof ( string ))
    whereClause += string .Format( " {0} {1} >= {2}" , filterObj.Conjunction, filterObj.Column,
    filterObj.Value);
   break ;
   case FilterOperator.LessThan:
   if (valueType != typeof ( string ))
    whereClause += string .Format( " {0} {1} < {2}" , filterObj.Conjunction, filterObj.Column,
    filterObj.Value);
   break ;
   case FilterOperator.LessThanOrEqual:
   if (valueType != typeof ( string ))
    whereClause += string .Format( " {0} {1} <= {2}" , filterObj.Conjunction, filterObj.Column,
    filterObj.Value);
   break ;
   case FilterOperator.StartsWith:
   if (valueType != typeof ( string ))
    whereClause += string .Format( " {0} {1}.StartsWith(\"{2}\")" , filterObj.Conjunction,
    filterObj.Column, filterObj.Value);
   break ;
   case FilterOperator.EndsWith:
   if (valueType != typeof ( string ))
    whereClause += string .Format( " {0} {1}.EndsWith(\"{2}\")" , filterObj.Conjunction,
    filterObj.Column, filterObj.Value);
   break ;
   case FilterOperator.Equals:
 
   whereClause +=
    string .Format(valueType == typeof ( string ) ? " {0} {1} == \"{2}\"" : " {0} {1} == {2}" ,
    filterObj.Conjunction, filterObj.Column, filterObj.Value);
   break ;
   case FilterOperator.NotEqual:
 
   whereClause +=
    string .Format(valueType == typeof ( string ) ? " {0} {1} != \"{2}\"" : " {0} {1} != {2}" ,
    filterObj.Conjunction, filterObj.Column, filterObj.Value);
   break ;
   default :
   throw new ArgumentOutOfRangeException();
  }
  }
  else
  {
  DateTime dt;
  DateTime.TryParse(filterObj.Value, out dt);
 
  switch (filterObj.Operator)
  {
   case FilterOperator.Contains:  
   break ;
   case FilterOperator.GreaterThan:
 
    whereClause += string .Format( " {0} {1} > DateTime(\"{2}\")" , filterObj.Conjunction, filterObj.Column, dt);
   break ;
   case FilterOperator.GreaterThanOrEqual:
 
   whereClause += string .Format( " {0} {1} >= DateTime(\"{2}\")" , filterObj.Conjunction, filterObj.Column, dt);
   break ;
   case FilterOperator.LessThan:
 
   whereClause += string .Format( " {0} {1} < DateTime(\"{2}\")" , filterObj.Conjunction, filterObj.Column, dt);
   break ;
   case FilterOperator.LessThanOrEqual:
   whereClause += string .Format( " {0} {1} <= DateTime(\"{2}\")" , filterObj.Conjunction, filterObj.Column, dt);
   break ;
   case FilterOperator.StartsWith:  
   break ;
   case FilterOperator.EndsWith:  
   break ;
   case FilterOperator.Equals:
   whereClause += string .Format( " {0} {1} == DateTime(\"{2}\")" , filterObj.Conjunction, filterObj.Column, dt);
   break ;
   case FilterOperator.NotEqual:
   whereClause += string .Format( " {0} {1} != DateTime(\"{2}\")" , filterObj.Conjunction, filterObj.Column, dt);
   break ;
   default :
   throw new ArgumentOutOfRangeException();
  }
  }
  return whereClause;
}
}

  。

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public class GridViewModelProvider
{
internal static CustomersViewModel GetCustomersViewModel(MyDbContext db, PagingInfo PagingData)
{
  int TotalItems = 0;
  var model = new CustomersViewModel()
  {
 
  Customers = GetResources(db.Customers.AsQueryable(), PagingData, out TotalItems), 
  PagingInfo = new PagingInfo()
  {
   CurrentPage = PagingData.CurrentPage,
   ItemsPerPage = PagingData.ItemsPerPage,
   PageOptions = new List< int >() { 10, 25, 50, 100 },
   ShowPageOptions = true ,
   SearchTerm = PagingData.SearchTerm,
   Sort = PagingData.Sort,
   Filters = PagingData.Filters
 
  };
 
  model.PagingInfo.TotalItems = TotalItems;
  model.JsonPagingInfo = Json.Encode(model.PagingInfo);
 
  return model;
}
 
private static IQueryable<Customer> GetResources(IQueryable<Customer> Customers, PagingInfo PagingData, out int TotalItems)
{
  var customers = Customers;
 
  //search
  if (! string .IsNullOrEmpty(PagingData.SearchTerm))
  {
  customers = customers.Where(x => (x.CompanyName.Contains(PagingData.SearchTerm) || x.ContactTitle.Contains(PagingData.SearchTerm)));
  }
 
  //filter
  if (PagingData.Filters != null )
 
  foreach (var filterObj in PagingData.Filters)
  {
   switch (filterObj.Column)
   {
   case "City" :
    if (filterObj.Value.ToLower() != "all" )
    customers = customers.Where(Extensions.GetWhereClause(filterObj, typeof ( string )));
    break ;
 
   //Add Other Filter Columns Here
   }
  }   
  }
 
 
  TotalItems = customers.Count();
 
  //sort
  customers = customers.OrderBy(x => x.Id);
  if (PagingData.Sort != null )
  {
  switch (PagingData.Sort.Direction)
  {
   case SortDirection.Ascending:
   if (PagingData.Sort.SortColumn == "CompanyName" )
   {
    customers = customers.OrderBy(x => x.CompanyName);
   }
   else if (PagingData.Sort.SortColumn == "ContactTitle" )
   {
    customers = customers.OrderBy(x => x.ContactTitle);
   }
   break ;
   case SortDirection.Descending:
   if (PagingData.Sort.SortColumn == "CompanyName" )
   {
    customers = customers.OrderByDescending(x => x.CompanyName);
   }
   else if (PagingData.Sort.SortColumn == "ContactTitle" )
   {
    customers = customers.OrderByDescending(x => x.ContactTitle);
   }
   break ;
   case SortDirection.NotSet:
   default :
   break ;
  }
  }
  customers = customers
  .Skip((PagingData.CurrentPage - 1) * PagingData.ItemsPerPage).Take(PagingData.ItemsPerPage);
 
  return customers;
}
}

  。

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/// <summary>
/// 启用查询谓词的高效,动态组合。
/// </summary>
public static class PredicateBuilder
{
/// <summary>
/// 创建一个计算结果为true的谓词。
/// </summary>
public static Expression<Func<T, bool >> True<T>() { return param => true ; }
 
/// <summary>
/// 创建一个计算结果为false的谓词
/// </summary>
public static Expression<Func<T, bool >> False<T>() { return param => false ; }
 
/// <summary>
/// 创建一个从指定的lambda表达式的谓词表达式。
/// </summary>
public static Expression<Func<T, bool >> Create<T>(Expression<Func<T, bool >> predicate) { return predicate; }
 
/// <summary>
/// 结合了第二第一谓词使用逻辑“and”。
/// </summary>
public static Expression<Func<T, bool >> And<T>( this Expression<Func<T, bool >> first, Expression<Func<T, bool >> second)
{
  return first.Compose(second, Expression.AndAlso);
}
 
/// <summary>
/// 结合了第二第一谓词使用逻辑“or”。
/// </summary>
public static Expression<Func<T, bool >> Or<T>( this Expression<Func<T, bool >> first, Expression<Func<T, bool >> second)
{
  return first.Compose(second, Expression.OrElse);
}
 
/// <summary>
///否定谓词
/// </summary>
public static Expression<Func<T, bool >> Not<T>( this Expression<Func<T, bool >> expression)
{
  var negated = Expression.Not(expression.Body);
  return Expression.Lambda<Func<T, bool >>(negated, expression.Parameters);
}
 
/// <summary>
/// 使用指定的合并函数,合并第二和第一表达式
/// </summary>
static Expression<T> Compose<T>( this Expression<T> first, Expression<T> second, Func<Expression, Expression, Expression> merge)
{
  //第二参数映射到第一参数
  var map = first.Parameters
  .Select((f, i) => new { f, s = second.Parameters[i] })
  .ToDictionary(p => p.s, p => p.f);
 
  //第一lambda表达式的参数替换在第二lambda表达式参数
  var secondBody = ParameterRebinder.ReplaceParameters(map, second.Body);
 
  //从第一个表达式创建一个带参数的合并lambda表达式
  return Expression.Lambda<T>(merge(first.Body, secondBody), first.Parameters);
}
 
class ParameterRebinder : ExpressionVisitor
{
  readonly Dictionary<ParameterExpression, ParameterExpression> map;
 
  ParameterRebinder(Dictionary<ParameterExpression, ParameterExpression> map)
  {
  this .map = map ?? new Dictionary<ParameterExpression, ParameterExpression>();
  }
 
  public static Expression ReplaceParameters(Dictionary<ParameterExpression, ParameterExpression> map, Expression exp)
  {
  return new ParameterRebinder(map).Visit(exp);
  }
 
  protected override Expression VisitParameter(ParameterExpression p)
  {
  ParameterExpression replacement;
 
  if (map.TryGetValue(p, out replacement))
  {
   p = replacement;
  }
 
  return base .VisitParameter(p);
  }
}
}

MyDbContext.CS代码

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public class MyDbContext : DbContext
{
public MyDbContext()
  : base ( "DefaultConnection" )
{
 
}
 
public DbSet<Customer> Customers { get ; set ; }
 
protected override void OnModelCreating(DbModelBuilder modelBuilder)
  modelBuilder.Entity<Customer>().Property(c => c.CompanyName).HasMaxLength(40);
  modelBuilder.Entity<Customer>().Property(c => c.ContactTitle).HasMaxLength(40);
}
}

HomeController.cs控制器

  。

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public class HomeController : Controller
{
public ActionResult Index()
{
  var model = new CustomersViewModel()
  {
  Customers = null ,
  PagingInfo = new PagingInfo()
  {
   CurrentPage= 1 ,
   ItemsPerPage= 10 ,
   PageOptions = new List< int >() { 10 , 25 , 50 , 100 },
   ShowPageOptions= true ,
   TotalItems= 1
  }
  };
  return View(model);
}
 
public ActionResult GetCustomers(PagingInfo PagingData)
{
  var db = new MyDbContext();
  var model = GridViewModelProvider.GetCustomersViewModel(db, PagingData); 
  return PartialView( "_CustomersPartial" , model);
}
 
public ActionResult About()
{
  ViewBag.Message = "您的应用程序描述页面。" ;
 
  return View();
}
 
public ActionResult Contact()
{
  ViewBag.Message = "您的联系页面。" ;
 
  return View();
}
}

Home视图文件夹下

_CustomersPartial.cshtml 。

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@model mesoft.gridview.Models.CustomersViewModel
 
@*在这里写下返回的数据的详细信息*@
< span class = "gridview-data-details" style = "display:none;" >@Html.Raw(Model.JsonPagingInfo)</ span >
 
< table class = "table table-bordered table-striped" >
  < thead >
  < tr class = "gridview-list-header" >
   < th >
   @(Html.DisplayNameFor(x => x.Customers.FirstOrDefault().Id))
   </ th >
   < th class = "sortable" data-sort = "CompanyName" >
   @(Html.DisplayNameFor(x => x.Customers.FirstOrDefault().CompanyName))
   </ th >
   < th class = "sortable" data-sort = "ContactTitle" >
   @(Html.DisplayNameFor(x => x.Customers.FirstOrDefault().ContactTitle))
   </ th >
   < th >
   @(Html.DisplayNameFor(x => x.Customers.FirstOrDefault().Country))
   </ th >
   < th >
   @(Html.DisplayNameFor(x => x.Customers.FirstOrDefault().City))
   </ th >
   < th >
   @(Html.DisplayNameFor(x => x.Customers.FirstOrDefault().Address))
   </ th >
   < th >
   @(Html.DisplayNameFor(x => x.Customers.FirstOrDefault().Phone))
   </ th >
   < th >
   @Html.DisplayNameFor(x=> x.Customers.FirstOrDefault().Founded)
   </ th >
  </ tr >
  </ thead >
 
  < tbody id = "CustomersTable" class = "gridview-list-items" >
  @if (Model.Customers.Any())
  {
   foreach (var c in Model.Customers)
   {
   < tr >
    < td class = "value" >@c.Id</ td >
    < td class = "value" >@c.CompanyName</ td >
    < td class = "value" >@c.ContactTitle</ td >
    < td class = "value" >@c.Country</ td >
    < td class = "value" >@c.City</ td >
    < td class = "Description" >@c.Address</ td >
    < td class = "value" >@c.Phone</ td >
    < td >@c.Founded</ td >
   </ tr >
   }
  }
  else
  {
   < tr >
   < td colspan = "8" >
    < div class = "alert alert-warning alert-dismissable" >
    < button type = "button" class = "close" data-dismiss = "alert" aria-hidden = "true" >×</ button >
    < strong >警告!</ strong > 没有客户找到!
    </ div >
   </ td >
   </ tr >
  }
 
  @Html.Raw(ViewBag.Script)
  </ tbody >
 
</ table >

_GridViewPartial.cshtml 。

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@model mesoft.gridview.Models.CustomersViewModel
 
<!-- GRIDVIEW-->
< div class = "gridview gridview1" >
  <!-- GridView Header-->
  < div class = "gridview-header" >
  <!--GridView的头的左边部分-->
  < div class = "col-sm-6" >
   < div class = "gridview-search" >
   < div class = "search input-group" >
    < input class = "form-control" placeholder = "Search" type = "search" >
    < span class = "input-group-btn" >
    < button class = "btn btn-default" type = "button" >
     < span class = "fa fa-search" ></ span >
     < span class = "sr-only" >Search</ span >
    </ button >
    </ span >
   </ div >
   </ div >
  </ div >
 
  <!-- GridView的头右边部分-->
  < div class = "col-sm-6 text-right" >
   <!-- 这里添加任何筛选操作-->
   @{
   string[] cityFilters = {"Istanbul", "Trabzon", "Ankara", "Izmir", "Samsun", "Erzurum"};
   }
 
   根据城市筛选:
   < div class = "btn-group" >
   < button type = "button" class = "btn btn-primary dropdown-toggle" data-toggle = "dropdown" >
    Select City < span class = "caret" ></ span >
   </ button >
   < ul class = "dropdown-menu filter-parent" role = "menu" >
    @foreach (var city in cityFilters)
    {
    < li >< a href = "#" class = "filter"
     data-filter-column = "City"   
     data-filter-value = "@city"
     data-filter-operator = "@mesoft.gridview.Models.FilterOperator.Equals"
     data-filter-conjunction = "@mesoft.gridview.Models.FilterConjunction.And" >@city</ a ></ li >
    }
    < li class = "divider" ></ li >
    < li class = "active" >< a href = "#" class = "filter"
      data-filter-column = "City"
      data-filter-value = "All" >All</ a ></ li >
   </ ul >
   </ div >
  </ div >
  </ div >
 
  <!-- GridView ViewPort-->
  < div class = "gridview-viewport" id = "viewport"
   data-getdata-function = "@Url.Action(" GetCustomers", "Home")"
   data-default-pagesize = "10" >
  < div class = "gridview-canvas" style = "min-height:400px;" >
   @*Data Will Load Here*@
  </ div >
  < div class = "loading gridview gridview-loader" >
   < img src = "~/content/images/loading.gif" />
  </ div >
  </ div >
  <!-- GridView的分页区域-->
  < div class = "gridview-footer" >
  @Html.DisplayFor(x => x.PagingInfo, "Pager")
  </ div >
</ div >

About.cshtml 。

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@{
  ViewBag.Title = "About";
}
< h2 >@ViewBag.Title.</ h2 >
< h3 >@ViewBag.Message</ h3 >
 
< p >#</ p >

Contact.cshtml 。

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@{
  ViewBag.Title = "Contact";
}
< h2 >@ViewBag.Title.</ h2 >
< h3 >@ViewBag.Message</ h3 >
 
< address >
  < strong >Support:</ strong > < a href = "827937686@qq.com" >827937686@qq.com</ a >< br />
</ address >

Index.cshtml 。

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@model mesoft.gridview.Models.CustomersViewModel
 
@{
  ViewBag.Title = "Home Page";
}
 
< div class = "jumbotron" >
  < h1 >Gridview</ h1 >
  < p class = "lead" >简单易用,开发简单</ p >
  < p >< a href = "#" class = "btn btn-primary btn-lg" >Learn more »</ a ></ p >
</ div >
<!-- GRIDVIEW Area-->
< div class = "row" >
  @Html.Partial("_GridViewPartial")
</ div >
 
@section Scripts {
  < script >
  $('.gridview1').meGridView();
  //$('.gridview2').meGridView();
  </ script >
 
}

Shared文件夹下:

_Layout.cshtml 。

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<!DOCTYPE html>
< html >
< head >
  < meta charset = "utf-8" />
  < meta name = "viewport" content = "width=device-width, initial-scale=1.0" >
  < title >@ViewBag.Title -GridView的用法示例应用程序</ title >
  @Styles.Render("~/Content/css")
  @Scripts.Render("~/bundles/modernizr")
 
</ head >
< body >
  < div class = "navbar navbar-inverse navbar-fixed-top" >
  < div class = "container" >
   < div class = "navbar-header" >
   < button type = "button" class = "navbar-toggle" data-toggle = "collapse" data-target = ".navbar-collapse" >
    < span class = "icon-bar" ></ span >
    < span class = "icon-bar" ></ span >
    < span class = "icon-bar" ></ span >
   </ button >
   @Html.ActionLink("GridView", "Index", "Home", new { area = "" }, new { @class = "navbar-brand" })
   </ div >
   < div class = "navbar-collapse collapse" >
   < ul class = "nav navbar-nav" >
    < li >@Html.ActionLink("Home", "Index", "Home")</ li >
    < li >@Html.ActionLink("About", "About", "Home")</ li >
    < li >@Html.ActionLink("Contact", "Contact", "Home")</ li >
   </ ul >
   @*@Html.Partial("_LoginPartial")*@
   </ div >
  </ div >
  </ div >
  < div class = "container body-content" >
  @RenderBody()
  < hr />
  < footer >
   < p >© @DateTime.Now.Year - WuLex</ p >
  </ footer >
  </ div >
 
  @Scripts.Render("~/bundles/jquery")
  @Scripts.Render("~/bundles/bootstrap")
  @RenderSection("scripts", required: false)
</ body >
</ html >

运行结果如图

灵活掌握Asp.net MVC中GridView的使用方法

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