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服务器之家 - 编程语言 - ASP.NET教程 - 灵活掌握Asp.net MVC中GridView的使用方法

灵活掌握Asp.net MVC中GridView的使用方法

2020-04-02 14:48天风隼 ASP.NET教程

这篇文章主要帮助大家灵活掌握Asp.net MVC中GridView的使用方法,具有一定的参考价值，感兴趣的小伙伴们可以参考一下

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

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。

  • asp.net
  • Gridview
  • MVC

    • 延伸 · 阅读

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