网站就必须用响应式布局吗？MVC视图展现模式之移动布局：http://www.cnblogs.com/dunitian/p/5213787.html
demo:http://pan.baidu.com/s/1bnTUaKJ
有人会疑问，为什么他能识别.mobile的后缀却不能识别例如：.mac .dnt 等等后缀呢？这些又是放在哪里的呢？
mobile 这个后缀其实是存放在：DisplayModeProvider.Instance.Modes 里面的，我们监视一下，发现里面就一个mobile，还有一个是默认的
可以猜想，运行的时候是从上往下匹配的，“”的是通用匹配，那么我们加入一个自定义的后缀看看==>(可以思考一下，为什么用 insert 不用 add)
//添加一个自定义后缀
DisplayModeProvider.Instance.Modes.Insert(0, new DefaultDisplayMode("dnt")
{
ContextCondition = (Context) => Context.Request.UserAgent.Contains("dnt")
});
可能你不是很理解 DefaultDisplayMode，看看反编译吧----构造函数为suffix赋值（后缀）
添加一个自定义的后缀视图
打开谷歌浏览器，设置一下User-Agent Switcher的浏览模式
附录：
DisplayModeProvider：
// Generated by .NET Reflector from F:\Work\Net\Mobile\packages\Microsoft.AspNet.WebPages.3.2.3\lib\net45\System.Web.WebPages.dll
namespace System.Web.WebPages
{
using System;
using System.Collections;
using System.Collections.Generic;
using System.Diagnostics;
using System.Runtime.CompilerServices;
using System.Web; public sealed class DisplayModeProvider
{
private static readonly object _displayModeKey = new object();
private readonly List<IDisplayMode> _displayModes;
private static readonly DisplayModeProvider _instance = new DisplayModeProvider();
public static readonly string DefaultDisplayModeId = string.Empty;
public static readonly string MobileDisplayModeId = "Mobile"; internal DisplayModeProvider()
{
List<IDisplayMode> list = new List<IDisplayMode>();
DefaultDisplayMode item = new DefaultDisplayMode(MobileDisplayModeId) {
ContextCondition = context => context.GetOverriddenBrowser().IsMobileDevice
};
list.Add(item);
list.Add(new DefaultDisplayMode());
this._displayModes = list;
} private int FindFirstAvailableDisplayMode(IDisplayMode currentDisplayMode, bool requireConsistentDisplayMode)
{
if (!requireConsistentDisplayMode || (currentDisplayMode == null))
{
return ;
}
int index = this._displayModes.IndexOf(currentDisplayMode);
if (index < )
{
return this._displayModes.Count;
}
return index;
} public IEnumerable<IDisplayMode> GetAvailableDisplayModesForContext(HttpContextBase httpContext, IDisplayMode currentDisplayMode)
{
return this.GetAvailableDisplayModesForContext(httpContext, currentDisplayMode, this.RequireConsistentDisplayMode);
} internal IEnumerable<IDisplayMode> GetAvailableDisplayModesForContext(HttpContextBase httpContext, IDisplayMode currentDisplayMode, bool requireConsistentDisplayMode)
{
int iteratorVariable0 = this.FindFirstAvailableDisplayMode(currentDisplayMode, requireConsistentDisplayMode);
for (int i = iteratorVariable0; i < this._displayModes.Count; i++)
{
IDisplayMode iteratorVariable2 = this._displayModes[i];
if (iteratorVariable2.CanHandleContext(httpContext))
{
yield return iteratorVariable2;
}
}
} public DisplayInfo GetDisplayInfoForVirtualPath(string virtualPath, HttpContextBase httpContext, Func<string, bool> virtualPathExists, IDisplayMode currentDisplayMode)
{
return this.GetDisplayInfoForVirtualPath(virtualPath, httpContext, virtualPathExists, currentDisplayMode, this.RequireConsistentDisplayMode);
} internal DisplayInfo GetDisplayInfoForVirtualPath(string virtualPath, HttpContextBase httpContext, Func<string, bool> virtualPathExists, IDisplayMode currentDisplayMode, bool requireConsistentDisplayMode)
{
for (int i = this.FindFirstAvailableDisplayMode(currentDisplayMode, requireConsistentDisplayMode); i < this._displayModes.Count; i++)
{
IDisplayMode mode = this._displayModes[i];
if (mode.CanHandleContext(httpContext))
{
DisplayInfo info = mode.GetDisplayInfo(httpContext, virtualPath, virtualPathExists);
if (info != null)
{
return info;
}
}
}
return null;
} internal static IDisplayMode GetDisplayMode(HttpContextBase context)
{
if (context == null)
{
return null;
}
return (context.Items[_displayModeKey] as IDisplayMode);
} internal static void SetDisplayMode(HttpContextBase context, IDisplayMode displayMode)
{
if (context != null)
{
context.Items[_displayModeKey] = displayMode;
}
} public static DisplayModeProvider Instance
{
get
{
return _instance;
}
} public IList<IDisplayMode> Modes
{
get
{
return this._displayModes;
}
} public bool RequireConsistentDisplayMode { get; set; } [CompilerGenerated]
private sealed class <GetAvailableDisplayModesForContext>d__4 : IEnumerable<IDisplayMode>, IEnumerable, IEnumerator<IDisplayMode>, IEnumerator, IDisposable
{
private int <>1__state;
private IDisplayMode <>2__current;
public IDisplayMode <>3__currentDisplayMode;
public HttpContextBase <>3__httpContext;
public bool <>3__requireConsistentDisplayMode;
public DisplayModeProvider <>4__this;
private int <>l__initialThreadId;
public int <first>5__5;
public int <i>5__6;
public IDisplayMode <mode>5__7;
public IDisplayMode currentDisplayMode;
public HttpContextBase httpContext;
public bool requireConsistentDisplayMode; [DebuggerHidden]
public <GetAvailableDisplayModesForContext>d__4(int <>1__state)
{
this.<>1__state = <>1__state;
this.<>l__initialThreadId = Environment.CurrentManagedThreadId;
} private bool MoveNext()
{
switch (this.<>1__state)
{
case :
this.<>1__state = -;
this.<first>5__5 = this.<>4__this.FindFirstAvailableDisplayMode(this.currentDisplayMode, this.requireConsistentDisplayMode);
this.<i>5__6 = this.<first>5__5;
goto Label_00A5; case :
this.<>1__state = -;
break; default:
goto Label_00BD;
}
Label_0097:
this.<i>5__6++;
Label_00A5:
if (this.<i>5__6 < this.<>4__this._displayModes.Count)
{
this.<mode>5__7 = this.<>4__this._displayModes[this.<i>5__6];
if (this.<mode>5__7.CanHandleContext(this.httpContext))
{
this.<>2__current = this.<mode>5__7;
this.<>1__state = ;
return true;
}
goto Label_0097;
}
Label_00BD:
return false;
} [DebuggerHidden]
IEnumerator<IDisplayMode> IEnumerable<IDisplayMode>.GetEnumerator()
{
DisplayModeProvider.<GetAvailableDisplayModesForContext>d__4 d__;
if ((Environment.CurrentManagedThreadId == this.<>l__initialThreadId) && (this.<>1__state == -))
{
this.<>1__state = ;
d__ = this;
}
else
{
d__ = new DisplayModeProvider.<GetAvailableDisplayModesForContext>d__4() {
<>4__this = this.<>4__this
};
}
d__.httpContext = this.<>3__httpContext;
d__.currentDisplayMode = this.<>3__currentDisplayMode;
d__.requireConsistentDisplayMode = this.<>3__requireConsistentDisplayMode;
return d__;
} [DebuggerHidden]
IEnumerator IEnumerable.GetEnumerator()
{
return this.System.Collections.Generic.IEnumerable<System.Web.WebPages.IDisplayMode>.GetEnumerator();
} [DebuggerHidden]
void IEnumerator.Reset()
{
throw new NotSupportedException();
} void IDisposable.Dispose()
{
} IDisplayMode IEnumerator<IDisplayMode>.Current
{
[DebuggerHidden]
get
{
return this.<>2__current;
}
} object IEnumerator.Current
{
[DebuggerHidden]
get
{
return this.<>2__current;
}
}
}
}
}
DefaultDisplayMode：
// Generated by .NET Reflector from F:\Work\Net\Mobile\packages\Microsoft.AspNet.WebPages.3.2.3\lib\net45\System.Web.WebPages.dll
namespace System.Web.WebPages
{
using System;
using System.IO;
using System.Runtime.CompilerServices;
using System.Web; public class DefaultDisplayMode : IDisplayMode
{
private readonly string _suffix; public DefaultDisplayMode() : this(DisplayModeProvider.DefaultDisplayModeId)
{
} public DefaultDisplayMode(string suffix)
{
this._suffix = suffix ?? string.Empty;
} public bool CanHandleContext(HttpContextBase httpContext)
{
if (this.ContextCondition != null)
{
return this.ContextCondition(httpContext);
}
return true;
} public virtual DisplayInfo GetDisplayInfo(HttpContextBase httpContext, string virtualPath, Func<string, bool> virtualPathExists)
{
string arg = this.TransformPath(virtualPath, this._suffix);
if ((arg != null) && virtualPathExists(arg))
{
return new DisplayInfo(arg, this);
}
return null;
} protected virtual string TransformPath(string virtualPath, string suffix)
{
if (string.IsNullOrEmpty(suffix))
{
return virtualPath;
}
string extension = Path.GetExtension(virtualPath);
return Path.ChangeExtension(virtualPath, suffix + extension);
} public Func<HttpContextBase, bool> ContextCondition { get; set; } public virtual string DisplayModeId
{
get
{
return this._suffix;
}
}
}
}
参考：https://msdn.microsoft.com/en-us/magazine/hh975347.aspx
http://www.asp.net/mvc/overview/older-versions/aspnet-mvc-4-mobile-features
http://*.com/questions/9354188/asp-net-mvc-4-mobile-display-modes-stop-working