分类目录归档：.Net

.Net

Using the ASP.NET MVC 3 Logon returnUrl Parameter

2012年5月7日.NET MVClogon、returnurlsheng00

razor:

@{
  ViewBag.Title = "登陆";
  Layout = "~/Views/Shared/_LoginLayout.cshtml";
  string retUrl = "";
  if (Request["ReturnUrl"] != null)
  {
    retUrl = ViewContext.HttpContext.Request["ReturnUrl"];
  }
}
@using (Html.BeginForm("Logon", "Account", new { model = this.Model, ReturnUrl = retUrl }))
{
//form
}

controller:

[HttpPost]
public ActionResult LogOn(LogOnModel model, string ReturnUrl)
{
  ViewBag.UserLogOut = true;
  if (!ModelState.IsValid)
    return View("Logon");
  if (ModelState.IsValid)
  {
    try
    {
      //login
    }
    catch (Exception e)
    {
      ModelState.AddModelError("", e.Message);
      return View(model);
    }
  }
  if (!string.IsNullOrEmpty(ReturnUrl))
    return Redirect(ReturnUrl);//return
  return RedirectToAction("Index", "Product");
}

UserSessionAuthorizeAttribute:

public class UserSessionAuthorizeAttribute : AuthorizeAttribute
{
  public override void OnAuthorization(AuthorizationContext  filterContext)
  {
    base.OnAuthorization(filterContext);
    if(//check session)
    {
      filterContext.Result = new RedirectToRouteResult(
        new System.Web.Routing.RouteValueDictionary
            {
              { "controller", "Account" },
              { "action", "LogOn" },
              { "ReturnUrl", filterContext.HttpContext.Request.RawUrl }
            });
    }
  }
}

本地iis二级域名设置

2012年3月8日IISIIS7、二级域名、子域名sheng00

mvc3 ajax refresh partial page

2012年3月6日.NET MVC、JavaScriptajax、mvc、partial、refreshsheng00

$.get('@(Url.Action("HeaderLinks", "Common" ))', function (data) {
            $('#header-links-wrapper').html(data);
        });

MVC3-Razor输出Html

2012年1月19日.NET MVC.Net、Html、MVC3、Razorsheng00

输出HTML代码（包含标签）：直接输出，

string html = "文本";
@html

输出HTML内容（不包含标签）：有两种方法，

第一种：

IHtmlString html=new HtmlString("文本");
@html ;

第二种：

string html = "文本";
@Html.Raw(html);

C#中实现单实例

2010年11月30日C#、设计模式singletonsheng00


public class SingletonDemo
{
    private static SingletonDemo theSingleton = null;
    private SingletonDemo() { }
    public static SingletonDemo Instance()
    {
        if (theSingleton == null)
        {
            theSingleton = new SingletonDemo();
        }
        return theSingleton;
    }
    static void Main(string[] args)
    {
        SingletonDemo s1 = SingletonDemo.Instance();
        SingletonDemo s2 = SingletonDemo.Instance();
        if (s1.Equals(s2))
        {
            Console.WriteLine("see, only one instance!");
        }
    }
}

.net mvc 中使用ActionFilterAttribute过滤器

2010年3月24日.NET MVCsheng00

过滤器是mvc中常用的
在.net mvc 中直接继承和实现ActionFilterAttribute类就可以了
很简单
下面贴出一个例子
过滤器：


public class UseStopwatchAttribute : ActionFilterAttribute
{
  public override void OnActionExecuting(ActionExecutingContext filterContext)
  {
    Stopwatch stopWatch = new Stopwatch();
    stopWatch.Start();
    filterContext.Controller.ViewData["stopWatch"] = stopWatch;
  }
  public override void OnResultExecuting(ResultExecutingContext filterContext)
  {
    Stopwatch stopWatch = (Stopwatch)filterContext.Controller.ViewData["stopWatch"];
    stopWatch.Stop();
    Random r = new Random();
    filterContext.Controller.ViewData["elapsedTime"] = stopWatch.ElapsedMilliseconds
    + " milliseconds -   Rand  " + r.Next(1000).ToString();
  }
}

这的话这个过滤器就写好了
在使用的时候只要在controller上写上就行了


[UseStopwatch]
public class ProductsController : Controller
{
  //
  // GET: /Store/Products/
  public ActionResult List()
  {
    return View();
  }
  public ActionResult Details()
  {
    return View();
  }
  public ActionResult AddReview()
  {
    return View();
  }
}

C#中同步、异步读取进程输出信息

2010年3月11日C#sheng00

1、异步的：

p.StartInfo.RedirectStandardError = true;
p.ErrorDataReceived += new DataReceivedEventHandler(OutputInfo);
p.Start();
p.BeginErrorReadLine();

private void OutputInfo(object sendProcess, DataReceivedEventArgs output){
  if (!String.IsNullOrEmpty(output.Data))
  {
    //处理方法...
  }
}

2、同步的

p.StartInfo.RedirectStandardError = true;
p.Start();
StreamReader sr = ffmpeg.StandardError;
p.WaitForExit();//之后就可以从sr里读了

C#中枚举类型enum的使用

2010年1月21日C#sheng00

1、关于enum的定义

enum Fabric
{
  Cotton = 1,
  Silk = 2,
  Wool = 4,
  Rayon = 8,
  Other = 128
}

2、符号名和常数值的互相转换

Fabric fab = Fabric.Cotton;
int fabNum = (int)fab;//转换为常数值。必须使用强制转换。
Fabric fabString = (Fabric)1;//常数值转换成符号名。如果使用ToString()，则是（（Fabric）1）.ToString()，注意必须有括号。
string fabType = fab.ToString();//显示符号名
string fabVal = fab.ToString ("D");//显示常数值

3、获得所有符号名的方法（具体参见Enum类）

public enum MyFamily
{
  YANGZHIPING = 1,
  GUANGUIQIN = 2,
  YANGHAORAN = 4,
  LIWEI = 8,
  GUANGUIZHI = 16,
  LISIWEN = 32,
  LISIHUA = 64,
}
foreach (string s in Enum.GetNames(typeof(MyFamily)))
{
  Console.WriteLine(s);
}

4、将枚举作为位标志来处理

根据下面的两个例子，粗略地说，一方面，设置标志[Flags]或者[FlagsAttribute]，则表明要将符号名列举出来；另一方面，可以通过强制转换，将数字转换为符号名。说不准确。看下面的例子体会吧。注意：

例一：

Fabric fab = Fabric.Cotton | Fabric.Rayon | Fabric.Silk;
Console.WriteLine("MyFabric = {0}", fab);//输出：Fabric.Cotton | Fabric.Rayon | Fabric.Silk;

例二：

class FlagsAttributeDemo
{
  // Define an Enum without FlagsAttribute.
  enum SingleHue : short
  {
    Black = 0,
    Red = 1,
    Green = 2,
    Blue = 4
  };
  // Define an Enum with FlagsAttribute.
  [FlagsAttribute]
  enum MultiHue : short
  {
    Black = 0,
    Red = 1,
    Green = 2,
    Blue = 4
  };
  static void Main( )
  {
    Console.WriteLine(
    "This example of the FlagsAttribute attribute n" +
    "generates the following output." );
    Console.WriteLine(
    "nAll possible combinations of values of an n" +
    "Enum without FlagsAttribute:n" );
    // Display all possible combinations of values.
    for( int val = 0; val <= 8; val++ )
    Console.WriteLine( "{0,3} – {1}",  val, ( (SingleHue)val ).ToString( ) );
    Console.WriteLine(  "nAll possible combinations of values of an n" + "Enum with FlagsAttribute:n" );
    // Display all possible combinations of values.
    // Also display an invalid value.
    for( int val = 0; val <= 8; val++ )
    Console.WriteLine ( "{0,3} – {1}",  val, ( (MultiHue)val ).ToString( ) );
  }
}
/*
This example of the FlagsAttribute attribute
generates the following output.
All possible combinations of values of an
Enum without FlagsAttribute:
0 – Black
1 – Red
2 – Green
3 – 3
4 – Blue
5 – 5
6 – 6
7 – 7
8 – 8
All possible combinations of values of an
Enum with FlagsAttribute:
0 – Black
1 – Red
2 – Green
3 – Red, Green
4 – Blue
5 – Red, Blue
6 – Green, Blue
7 – Red, Green, Blue
8 – 8
*/

5、枚举作为函数参数。经常和switch结合起来使用。下面举例

public static double GetPrice(Fabric fab)
{
  switch (fab)
  {
    case Fabric.Cotton:
      return (3.55);
    case Fabric.Silk:
      return (5.65);
    case Fabric.Wool:
      return (4.05);
    case Fabric.Rayon:
      return (3.20);
    case Fabric.Other:
      return (2.50);
    default:
      return (0.0);
  }
}

6、上面三点一个完整的例子

//enum的定义
public enum Fabric : short
{
  Cotton = 1,
  Silk = 2,
  Wool = 3,
  Rayon = 8,
  Other = 128
}
//将枚举作为参数传递
public static double GetPrice(Fabric fab)
{
  switch (fab)
  {
    case Fabric.Cotton: return (3.55);
    case Fabric.Silk : return (5.65);
    case Fabric.Wool: return (4.05);
    case Fabric.Rayon: return (3.20);
    case Fabric.Other: return (2.50);
    default: return (0.0);
  }
}
public static void Main()
{
  Fabric fab = Fabric.Cotton;
  int fabNum = (int)fab;
  string fabType = fab.ToString();
  string fabVal = fab.ToString ("D");
  double cost = GetPrice(fab);
  Console.WriteLine("fabNum = {0}nfabType = {1}nfabVal = {2}n", fabNum, fabType, fabVal);
  Console.WriteLine("cost = {0}", cost);
}

7、Enum类的使用

Enum.IsDefinde、Enum.Parse两种方法经常一起使用，来确定一个值或符号是否是一个枚举的成员，然后创建一个实例。Enum.GetName打印出一个成员的值；Enum.GetNames打印出所有成员的值。其中注意**“`typeof“`**的使用。这一点很重要。

public enum MyFamily
{
  YANGZHIPING = 1,
  GUANGUIQIN = 2,
  YANGHAORAN = 4,
  LIWEI = 8,
  GUANGUIZHI = 16,
  LISIWEN = 32,
  LISIHUA = 64,
}
string s = "YANGHAORAN";
if (Enum.IsDefined(typeof(MyFamily), s))
{
  MyFamily f = (MyFamily)Enum.Parse(typeof(MyFamily), s);
  GetMyFamily(f);
  Console.WriteLine("The name is:" + Enum. GetName(typeof(MyFamily), 2));
  string[] sa = Enum.GetNames(typeof(MyFamily));
  foreach (string ss in sa)
  {
    Console.WriteLine(ss);
  }
}

list contains 类

2010年1月13日C#sheng00

Subscription sub = new Subscription();
sub.Appname = subName;
if (this.Subscriptions.Contains(sub,new SubcriptionComparer<Subscription>()))
  return true;
else
  return false;
class SubcriptionComparer<T> : IEqualityComparer<T>
where T : Subscription
{
  public int GetHashCode(T obj)
  {
    return obj.GetHashCode();
  }
  public bool Equals(T t1, T t2)
  {
    return t1.Appname == t2.Appname;
  }
}

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