【下载文档:  灵活掌握Asp.net_MVC中GridView的使用方法.txt 】

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灵活掌握Asp.net MVC中GridView的使用方法
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:
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; }
}
public class CustomersViewModel
{
public IQueryable Customers { get; set; }
public PagingInfo PagingInfo { get; set; }
public string JsonPagingInfo { get; set; }
}
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> GetExpression(IList filters)
{
if (filters.Count == 0)
return null;
ParameterExpression param = Expression.Parameter(typeof(T), "t");
Expression exp = null;
if (filters.Count == 1)
exp = GetExpression(param, filters[0]);
else if (filters.Count == 2)
exp = GetExpression(param, filters[0], filters[1]);
else
{
while (filters.Count > 0)
{
var f1 = filters[0];
var f2 = filters[1];
if (exp == null)
exp = GetExpression(param, filters[0], filters[1]);
else
exp = Expression.AndAlso(exp, GetExpression(param, filters[0], filters[1]));
filters.Remove(f1);
filters.Remove(f2);
if (filters.Count == 1)
{
exp = Expression.AndAlso(exp, GetExpression(param, filters[0]));
filters.RemoveAt(0);
}
}
}
return Expression.Lambda>(exp, param);
}
private static Expression GetExpression(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 (ParameterExpression param, FilterObject filter1, FilterObject filter2)
{
Expression bin1 = GetExpression(param, filter1);
Expression bin2 = GetExpression(param, filter2);
return Expression.AndAlso(bin1, bin2);
}
}
public class PagingInfo
{
public List 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 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;
}
}
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() { 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 GetResources(IQueryable 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;
}
}
///

/// 启用查询谓词的高效，动态组合。
///

public static class PredicateBuilder
{
///

/// 创建一个计算结果为true的谓词。
///

public static Expression> True() { return param => true; }
///

/// 创建一个计算结果为false的谓词
///

public static Expression> False() { return param => false; }
///

/// 创建一个从指定的lambda表达式的谓词表达式。
///

public static Expression> Create(Expression> predicate) { return predicate; }
///

/// 结合了第二第一谓词使用逻辑“and”。
///

public static Expression> And(this Expression> first, Expression> second)
{
return first.Compose(second, Expression.AndAlso);
}
///

/// 结合了第二第一谓词使用逻辑“or”。
///

public static Expression> Or(this Expression> first, Expression> second)
{
return first.Compose(second, Expression.OrElse);
}
///

///否定谓词
///

public static Expression> Not(this Expression> expression)
{
var negated = Expression.Not(expression.Body);
return Expression.Lambda>(negated, expression.Parameters);
}
///

/// 使用指定的合并函数，合并第二和第一表达式
///

static Expression Compose(this Expression first, Expression second, Func 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(merge(first.Body, secondBody), first.Parameters);
}
class ParameterRebinder : ExpressionVisitor
{
readonly Dictionary map;
ParameterRebinder(Dictionary map)
{
this.map = map ?? new Dictionary();
}
public static Expression ReplaceParameters(Dictionary 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:
public class MyDbContext : DbContext
{
public MyDbContext()
: base("DefaultConnection")
{
}
public DbSet Customers { get; set; }
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
modelBuilder.Entity().Property(c => c.CompanyName).HasMaxLength(40);
modelBuilder.Entity().Property(c => c.ContactTitle).HasMaxLength(40);
}
}
HomeController.cs控制器:
public class HomeController : Controller
{
public ActionResult Index()
{
var model = new CustomersViewModel()
{
Customers = null,
PagingInfo = new PagingInfo()
{
CurrentPage=1,
ItemsPerPage= 10,
PageOptions = new List() { 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
@model mesoft.gridview.Models.CustomersViewModel
@*在这里写下返回的数据的详细信息*@
@Html.Raw(Model.JsonPagingInfo)














@if (Model.Customers.Any())
{
foreach (var c in Model.Customers)
{










}
}
else
{



}
@Html.Raw(ViewBag.Script)

@(Html.DisplayNameFor(x => x.Customers.FirstOrDefault().Id))	@(Html.DisplayNameFor(x => x.Customers.FirstOrDefault().CompanyName))	@(Html.DisplayNameFor(x => x.Customers.FirstOrDefault().ContactTitle))	@(Html.DisplayNameFor(x => x.Customers.FirstOrDefault().Country))	@(Html.DisplayNameFor(x => x.Customers.FirstOrDefault().City))	@(Html.DisplayNameFor(x => x.Customers.FirstOrDefault().Address))	@(Html.DisplayNameFor(x => x.Customers.FirstOrDefault().Phone))	@Html.DisplayNameFor(x=> x.Customers.FirstOrDefault().Founded)
@c.Id	@c.CompanyName	@c.ContactTitle	@c.Country	@c.City	@c.Address	@c.Phone	@c.Founded
× 警告！ 没有客户找到！

_GridViewPartial.cshtml
@model mesoft.gridview.Models.CustomersViewModel

Search

@{
string[] cityFilters = {"Istanbul", "Trabzon", "Ankara", "Izmir", "Samsun", "Erzurum"};
}
根据城市筛选:

Select City

@foreach (var city in cityFilters)
{

• 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

}



• data-filter-column="City"
  data-filter-value="All">All

data-getdata-function="@Url.Action("GetCustomers", "Home")"
data-default-pagesize="10">

@*Data Will Load Here*@

@Html.DisplayFor(x => x.PagingInfo, "Pager")

About.cshtml
@{
ViewBag.Title = "About";
}

@ViewBag.Title.

@ViewBag.Message

#

Contact.cshtml
@{
ViewBag.Title = "Contact";
}

@ViewBag.Title.

@ViewBag.Message

Support: 827937686@qq.com

Index.cshtml
@model mesoft.gridview.Models.CustomersViewModel
@{
ViewBag.Title = "Home Page";
}

Gridview

简单易用，开发简单

Learn more »

@Html.Partial("_GridViewPartial")

@section Scripts {

}
Shared文件夹下：
_Layout.cshtml






@Styles.Render("~/Content/css")
@Scripts.Render("~/bundles/modernizr")

@Html.ActionLink("GridView", "Index", "Home", new { area = "" }, new { @class = "navbar-brand" })

• @Html.ActionLink("Home", "Index", "Home")


• @Html.ActionLink("About", "About", "Home")


• @Html.ActionLink("Contact", "Contact", "Home")

@*@Html.Partial("_LoginPartial")*@

@RenderBody()

---

@Scripts.Render("~/bundles/jquery")
@Scripts.Render("~/bundles/bootstrap")
@RenderSection("scripts", required: false)


运行结果如图:
为大家附3个精彩的专题：
ASP.NET控件使用手册
ASP.NET数据绑定控件使用汇总
ASP.NET控件使用汇总
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中文源码网。