模型绑定（用于获取表单或者URL提交的参数）


1，基本模型绑定（你可以直接在参数中用字符串，整型变量，实体或者是List<实体>的方式获取表单提交的参数）

例1：

publicViewResultDetails(intid){Albumalbum=db.Album.Find(id);returnView(album);}

匹配URL:

http://localhost/Home/Details/1

http://localhost/Home/Details?Id=1

匹配表单：

<input type="text" name="id" value="1" />


例2：

[HttpPost]publicActionResultCreate(Albumalbum){if(ModelState.IsValid){db.Album.Add(album);db.SaveChanges();returnRedirectToAction("Index");}ViewBag.GenreId=newSelectList(db.Genres,"GenreId","Name",album.GenreId);ViewBag.ArtistId=newSelectList(db.Artists,"ArtistId","Name",album.ArtistId);returnView(album);}

匹配表单：

<input type="text" name="id" value="1" />

<input type="text" name="name" value="tom" />



2，显示模型绑定（UpdateModel与TryUpdateModel都用于显示模型绑定）

UpdateModel:如果绑定期间出现错误，则会抛出异常

[HttpPost]publicActionResultEdit(){Albumalbum=newAlbum();try{UpdateModel(album);db.Entry(album).State=EntityState.Modified;db.SaveChanges();returnRedirectToAction("Index");}catch{ViewBag.GenreId=newSelectList(db.Genres,"GenreId","Name",album.GenreId);ViewBag.ArtistId=newSelectList(db.Artists,"ArtistId","Name",album.ArtistId);returnView(album);}}


TryUpdateModel：不会抛出异常，它会返回一个bool值，true为绑定成功，false为绑定失败

[HttpPost]publicActionResultEdit(){Albumalbum=newAlbum();if(TryUpdateModel(album)){db.Entry(album).State=EntityState.Modified;db.SaveChanges();returnRedirectToAction("Index");}ViewBag.GenreId=newSelectList(db.Genres,"GenreId","Name",album.GenreId);ViewBag.ArtistId=newSelectList(db.Artists,"ArtistId","Name",album.ArtistId);returnView(album);}


3，模型状态

[HttpPost]publicActionResultCreate(Albumalbum){if(ModelState.IsValid)//模型状态{db.Album.Add(album);db.SaveChanges();returnRedirectToAction("Index");}ViewBag.GenreId=newSelectList(db.Genres,"GenreId","Name",album.GenreId);ViewBag.ArtistId=newSelectList(db.Artists,"ArtistId","Name",album.ArtistId);returnView(album);}