浅谈ASP.NET 页面之间传值的几种方式
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2022-03-20 21:19:04
lASP.NET MVC系列文章 【01】浅谈Google Chrome浏览器（理论篇） 【02】浅谈Google Chrome浏览器（操作篇）（上） 【03】浅谈Google Chrome浏览器（操作篇）（下） 【04】浅谈ASP.NET框架 【05】浅谈ASP.NET MVC运行过程 【06】浅 ......
lASP.NET MVC系列文章
【01】
一 引入背景
我们知道，MVC基架为我们提供了很多基础类，当需要使用时，只需调用即可，以ActionResult为例，其有很多子类，如ContentResult,EmptyResult,FileResult,HttpStatusCodeResult,JavaScriptResult,JsonResult,RedirectResult,RedirectToRouteResult,ViewResultBase,FileContentResult,FilePathResult,FileStreamResult,ViewResult,PartialResult,
然而，尽管MVC基架提供了众多类供我们调用，但却并不是包括所有功能的类，比如，我需要返回XML格式的数据，或下载CSV格式的数据，此时，MVC基架就没提供相应的类。因此，MVC类的扩展就迫在眉睫了。
在本篇文章中，主要讲解MVC比较核心的八大扩展类，一共分为两篇，即浅谈ASP.NET MVC八大类扩展(上篇)和浅谈ASP.NET MVC八大类扩展(下篇)。
其中，本篇文章主要讲解MVC基架提供的ActionResult及其子孙类，自定义扩展XMLResult和CsvResult，下篇文章将讲解剩下的七大类自定义扩展：Filter扩展，RazorViewEngine扩展，HtmlHelper扩展，Validator扩展，ModelBinder扩展，ControllerFactory注入扩展，Lambda 树扩展。
二 ASP.NET MVC扩展概述
但凡涉及到架构，我们首先都会关心安全性，稳定性，可扩展性等特征，当然，ASO.NET MVC也不例外，MVC之所以比WebForm流行，不仅仅在于其实现前后端的松耦合，而且其也支持强大的自定义扩展，在本篇文章中，我们就是运用MVC支持自定义扩展这一特性来进行自定义扩展，从而实现个性化项目需求。
三 代码实例
（一） ActionResult扩展
1 AtionResult内置扩展
ASP.NET MVC提供了如下内置扩展类.
1.1 上图简要概述
(1)ActionResult类继承Object类；
(2)ContentResult,EmptyResult,FileResult,HttpStatusCodeResult,JavaScriptResult,JsonResult,ViewResultBase,RedirectToRouteResult,RedirectResult 九大类继承类ActionResult；
(3)FileContentResult，FilePathResult，FileStreamResult 三大类继承类FileResult；
(4)ViewResult,PartialViewResult两大类继承类ViewResultBase;
1.2 ActionResult讲解
功能：封装一个操作方法的结果并用于代表该操作方法执行框架级操作。
在Mvc中，我们对如下代码再熟悉不过了。
public ActionResult Index()
{
return View();
}
F12查看ActionResult定义
1 namespace System.Web.Mvc
2 {
3 //
4 // 摘要:
5 // 表示操作方法的结果。
6 public abstract class ActionResult
7 {
8 //
9 // 摘要:
10 // 初始化 System.Web.Mvc.ActionResult 类的新实例。
11 protected ActionResult();
12
13 //
14 // 摘要:
15 // 通过从 System.Web.Mvc.ActionResult 类继承的自定义类型，启用对操作方法结果的处理。
16 //
17 // 参数:
18 // context:
19 // 用于执行结果的上下文。上下文信息包括控制器、HTTP 内容、请求上下文和路由数据。
20 public abstract void ExecuteResult(ControllerContext context);
21 }
22 }
不难看出，ActionResult具有如下特征：
(1)抽象类；
(2)一个只可继承的构造函数；
(3)一个未实现的抽象方法；
1.2.1 ContentResult讲解
功能：表示用户定义的内容类型，该类型是操作方法的结果。
定义：查看定义
不难看出，ContentResult具有如下特征：
(1)继承自类ActionResult
(2)包含一个构造方法，一个重写ActionResultl类的抽象方法ExecuteResult(ControllerContext context)，和三个属性；
(3)完整定义
1 public class ContentResult : ActionResult
2 {
3 // Methods
4 public override void ExecuteResult(ControllerContext context)
5 {
6 if (context == null)
7 {
8 throw new ArgumentNullException("context");
9 }
10 HttpResponseBase response = context.HttpContext.Response;
11 if (!string.IsNullOrEmpty(this.ContentType))
12 {
13 response.ContentType = this.ContentType;
14 }
15 if (this.ContentEncoding != null)
16 {
17 response.ContentEncoding = this.ContentEncoding;
18 }
19 if (this.Content != null)
20 {
21 response.Write(this.Content);
22 }
23 }
24
25 // Properties
26 public string Content { get; set; }
27
28 public Encoding ContentEncoding { get; set; }
29
30 public string ContentType { get; set; }
31 }
32
33
(4)我们来看看具体例子：
如我们向页面输出“Alan_beijing”，可采取如下两种方式。
方式一：
1 public ContentResult ContextResultTest()
2 {
3 return Content("Alan_beijing");
4 }
测试结果
方式二
1 public ContentResult ContextResultTest()
2 {
3 //string str = "<html>" + "<head></head>" + "<body>" + "Alan_beijing" + "</body>" + "</html>";
4 string str = "<html><head></head></body>Alan_beijing</body></html>";
5 return Content(str);
6 }
测试结果
总之，大家在使用时，可以把ContentResult当作Responce.Write()使用。
1.2.2 EmptyResult
功能：表示一个不执行任何操作的结果，如不返回任何内容的控制器操作方法。
(1)查看定义
(2)完整定义
1 public class EmptyResult : ActionResult
2 {
3 // Fields
4 private static readonly EmptyResult _singleton = new EmptyResult();
5
6 // Methods
7 public override void ExecuteResult(ControllerContext context)
8 {
9 }
10
11 // Properties
12 internal static EmptyResult Instance =>
13 _singleton;
14 }
(3)总结
EmptyResult不执行任何操作，相当于如下功能。
1 public ContentResult ContextResultTest()
2 {
3 return Content("");
4 }
1.2.3 FileResult
功能：表示一个用于将二进制文件内容发送到响应的基类。
(1)查看定义
(2)完整定义
1 public abstract class FileResult : ActionResult
2 {
3 // Fields
4 private string _fileDownloadName;
5
6 // Methods
7 protected FileResult(string contentType)
8 {
9 if (string.IsNullOrEmpty(contentType))
10 {
11 throw new ArgumentException(MvcResources.Common_NullOrEmpty, "contentType");
12 }
13 this.ContentType = contentType;
14 }
15
16 public override void ExecuteResult(ControllerContext context)
17 {
18 if (context == null)
19 {
20 throw new ArgumentNullException("context");
21 }
22 HttpResponseBase response = context.HttpContext.Response;
23 response.ContentType = this.ContentType;
24 if (!string.IsNullOrEmpty(this.FileDownloadName))
25 {
26 string headerValue = ContentDispositionUtil.GetHeaderValue(this.FileDownloadName);
27 context.HttpContext.Response.AddHeader("Content-Disposition", headerValue);
28 }
29 this.WriteFile(response);
30 }
31
32 protected abstract void WriteFile(HttpResponseBase response);
33
34 // Properties
35 public string ContentType { get; private set; }
36
37 public string FileDownloadName
38 {
39 get =>
40 (this._fileDownloadName ?? string.Empty);
41 set
42 {
43 this._fileDownloadName = value;
44 }
45 }
46
47 // Nested Types
48 internal static class ContentDispositionUtil
49 {
50 // Fields
51 private const string HexDigits = "0123456789ABCDEF";
52
53 // Methods
54 private static void AddByteToStringBuilder(byte b, StringBuilder builder)
55 {
56 builder.Append('%');
57 int num = b;
58 AddHexDigitToStringBuilder(num >> 4, builder);
59 AddHexDigitToStringBuilder(num % 0x10, builder);
60 }
61
62 private static void AddHexDigitToStringBuilder(int digit, StringBuilder builder)
63 {
64 builder.Append("0123456789ABCDEF"[digit]);
65 }
66
67 private static string CreateRfc2231HeaderValue(string filename)
68 {
69 StringBuilder builder = new StringBuilder("attachment; filename*=UTF-8''");
70 foreach (byte num in Encoding.UTF8.GetBytes(filename))
71 {
72 if (IsByteValidHeaderValueCharacter(num))
73 {
74 builder.Append((char) num);
75 }
76 else
77 {
78 AddByteToStringBuilder(num, builder);
79 }
80 }
81 return builder.ToString();
82 }
83
84 public static string GetHeaderValue(string fileName)
85 {
86 foreach (char ch in fileName)
87 {
88 if (ch > '\x007f')
89 {
90 return CreateRfc2231HeaderValue(fileName);
91 }
92 }
93 ContentDisposition disposition = new ContentDisposition {
94 FileName = fileName
95 };
96 return disposition.ToString();
97 }
98
99 private static bool IsByteValidHeaderValueCharacter(byte b)
100 {
101 if ((0x30 <= b) && (b <= 0x39))
102 {
103 return true;
104 }
105 if ((0x61 <= b) && (b <= 0x7a))
106 {
107 return true;
108 }
109 if ((0x41 <= b) && (b <= 90))
110 {
111 return true;
112 }
113 switch (b)
114 {
115 case 0x3a:
116 case 0x5f:
117 case 0x7e:
118 case 0x24:
119 case 0x26:
120 case 0x21:
121 case 0x2b:
122 case 0x2d:
123 case 0x2e:
124 return true;
125 }
126 return false;
127 }
128 }
129 }
1.2.4 HttpStatusCodeResult
功能：提供一种用于返回带特定 HTTP 响应状态代码和说明的操作结果的方法。
(1)定义
(2)完整定义
1 public class HttpStatusCodeResult : ActionResult
2 {
3 // Methods
4 public HttpStatusCodeResult(int statusCode) : this(statusCode, null)
5 {
6 }
7
8 public HttpStatusCodeResult(HttpStatusCode statusCode) : this(statusCode, null)
9 {
10 }
11
12 public HttpStatusCodeResult(int statusCode, string statusDescription)
13 {
14 this.StatusCode = statusCode;
15 this.StatusDescription = statusDescription;
16 }
17
18 public HttpStatusCodeResult(HttpStatusCode statusCode, string statusDescription) : this((int) statusCode, statusDescription)
19 {
20 }
21
22 public override void ExecuteResult(ControllerContext context)
23 {
24 if (context == null)
25 {
26 throw new ArgumentNullException("context");
27 }
28 context.HttpContext.Response.StatusCode = this.StatusCode;
29 if (this.StatusDescription != null)
30 {
31 context.HttpContext.Response.StatusDescription = this.StatusDescription;
32 }
33 }
34
35 // Properties
36 public int StatusCode { get; private set; }
37
38 public string StatusDescription { get; private set; }
39 }
1.2.5 JavaScriptResult
功能：将 JavaScript 内容发送到响应。
(1)定义
(2)完整定义
1 public class JavaScriptResult : ActionResult
2 {
3 // Methods
4 public override void ExecuteResult(ControllerContext context)
5 {
6 if (context == null)
7 {
8 throw new ArgumentNullException("context");
9 }
10 HttpResponseBase response = context.HttpContext.Response;
11 response.ContentType = "application/x-javascript";
12 if (this.Script != null)
13 {
14 response.Write(this.Script);
15 }
16 }
17
18 // Properties
19 public string Script { get; set; }
20 }
1.2.6 JsonResult
功能：表示一个类，该类用于将 JSON 格式的内容发送到响应。
(1)定义
(2)完整定义
1 public class JsonResult : ActionResult
2 {
3 // Methods
4 public JsonResult()
5 {
6 this.JsonRequestBehavior = JsonRequestBehavior.DenyGet;
7 }
8
9 public override void ExecuteResult(ControllerContext context)
10 {
11 if (context == null)
12 {
13 throw new ArgumentNullException("context");
14 }
15 if ((this.JsonRequestBehavior == JsonRequestBehavior.DenyGet) && string.Equals(context.HttpContext.Request.HttpMethod, "GET", StringComparison.OrdinalIgnoreCase))
16 {
17 throw new InvalidOperationException(MvcResources.JsonRequest_GetNotAllowed);
18 }
19 HttpResponseBase response = context.HttpContext.Response;
20 if (!string.IsNullOrEmpty(this.ContentType))
21 {
22 response.ContentType = this.ContentType;
23 }
24 else
25 {
26 response.ContentType = "application/json";
27 }
28 if (this.ContentEncoding != null)
29 {
30 response.ContentEncoding = this.ContentEncoding;
31 }
32 if (this.Data != null)
33 {
34 JavaScriptSerializer serializer = new JavaScriptSerializer();
35 if (this.MaxJsonLength.HasValue)
36 {
37 serializer.MaxJsonLength = this.MaxJsonLength.Value;
38 }
39 if (this.RecursionLimit.HasValue)
40 {
41 serializer.RecursionLimit = this.RecursionLimit.Value;
42 }
43 response.Write(serializer.Serialize(this.Data));
44 }
45 }
46
47 // Properties
48 public Encoding ContentEncoding { get; set; }
49
50 public string ContentType { get; set; }
51
52 public object Data { get; set; }
53
54 public JsonRequestBehavior JsonRequestBehavior { get; set; }
55
56 public int? MaxJsonLength { get; set; }
57
58 public int? RecursionLimit { get; set; }
59 }
(3)总结
JsonResult首先将指定的对象序列化为Json字符串，然后将字符串写入到HTTP输出流。
1.2.7 RedirectResult
功能：通过重定向到指定的 URI 来控制对应用程序操作的处理。
(1)定义
(2)完整定义
1 public class RedirectResult : ActionResult
2 {
3 // Methods
4 public RedirectResult(string url) : this(url, false)
5 {
6 }
7
8 public RedirectResult(string url, bool permanent)
9 {
10 if (string.IsNullOrEmpty(url))
11 {
12 throw new ArgumentException(MvcResources.Common_NullOrEmpty, "url");
13 }
14 this.Permanent = permanent;
15 this.Url = url;
16 }
17
18 public override void ExecuteResult(ControllerContext context)
19 {
20 if (context == null)
21 {
22 throw new ArgumentNullException("context");
23 }
24 if (context.IsChildAction)
25 {
26 throw new InvalidOperationException(MvcResources.RedirectAction_CannotRedirectInChildAction);
27 }
28 string url = UrlHelper.GenerateContentUrl(this.Url, context.HttpContext);
29 context.Controller.TempData.Keep();
30 if (this.Permanent)
31 {
32 context.HttpContext.Response.RedirectPermanent(url, false);
33 }
34 else
35 {
36 context.HttpContext.Response.Redirect(url, false);
37 }
38 }
39
40 // Properties
41 public bool Permanent { get; private set; }
42
43 public string Url { get; private set; }
44 }
1.2.8 RedirectToRouteResult
功能：表示使用指定的路由值字典来执行重定向的结果。
（1）定义
(2)完整定义
1 public class RedirectToRouteResult : ActionResult
2 {
3 // Fields
4 private RouteCollection _routes;
5
6 // Methods
7 public RedirectToRouteResult(RouteValueDictionary routeValues) : this(null, routeValues)
8 {
9 }
10
11 public RedirectToRouteResult(string routeName, RouteValueDictionary routeValues) : this(routeName, routeValues, false)
12 {
13 }
14
15 public RedirectToRouteResult(string routeName, RouteValueDictionary routeValues, bool permanent)
16 {
17 this.Permanent = permanent;
18 this.RouteName = routeName ?? string.Empty;
19 this.RouteValues = routeValues ?? new RouteValueDictionary();
20 }
21
22 public override void ExecuteResult(ControllerContext context)
23 {
24 if (context == null)
25 {
26 throw new ArgumentNullException("context");
27 }
28 if (context.IsChildAction)
29 {
30 throw new InvalidOperationException(MvcResources.RedirectAction_CannotRedirectInChildAction);
31 }
32 string str = UrlHelper.GenerateUrl(this.RouteName, null, null, this.RouteValues, this.Routes, context.RequestContext, false);
33 if (string.IsNullOrEmpty(str))
34 {
35 throw new InvalidOperationException(MvcResources.Common_NoRouteMatched);
36 }
37 context.Controller.TempData.Keep();
38 if (this.Permanent)
39 {
40 context.HttpContext.Response.RedirectPermanent(str, false);
41 }
42 else
43 {
44 context.HttpContext.Response.Redirect(str, false);
45 }
46 }
47
48 // Properties
49 public bool Permanent { get; private set; }
50
51 public string RouteName { get; private set; }
52
53 internal RouteCollection Routes
54 {
55 get
56 {
57 if (this._routes == null)
58 {
59 this._routes = RouteTable.Routes;
60 }
61 return this._routes;
62 }
63 set
64 {
65 this._routes = value;
66 }
67 }
68
69 public RouteValueDictionary RouteValues { get; private set; }
70 }
1.2.9 ViewResultBase
功能：表示一个用于为视图提供模型并向响应呈现视图的基类。
(1)定义
(2)完整定义
1 public abstract class ViewResultBase : ActionResult
2 {
3 // Fields
4 private DynamicViewDataDictionary _dynamicViewData;
5 private TempDataDictionary _tempData;
6 private ViewDataDictionary _viewData;
7 private ViewEngineCollection _viewEngineCollection;
8 private string _viewName;
9
10 // Methods
11 protected ViewResultBase()
12 {
13 }
14
15 public override void ExecuteResult(ControllerContext context)
16 {
17 if (context == null)
18 {
19 throw new ArgumentNullException("context");
20 }
21 if (string.IsNullOrEmpty(this.ViewName))
22 {
23 this.ViewName = context.RouteData.GetRequiredString("action");
24 }
25 ViewEngineResult result = null;
26 if (this.View == null)
27 {
28 result = this.FindView(context);
29 this.View = result.View;
30 }
31 TextWriter output = context.HttpContext.Response.Output;
32 ViewContext viewContext = new ViewContext(context, this.View, this.ViewData, this.TempData, output);
33 this.View.Render(viewContext, output);
34 if (result != null)
35 {
36 result.ViewEngine.ReleaseView(context, this.View);
37 }
38 }
39
40 protected abstract ViewEngineResult FindView(ControllerContext context);
41
42 // Properties
43 public object Model =>
44 this.ViewData.Model;
45
46 public TempDataDictionary TempData
47 {
48 get
49 {
50 if (this._tempData == null)
51 {
52 this._tempData = new TempDataDictionary();
53 }
54 return this._tempData;
55 }
56 set
57 {
58 this._tempData = value;
59 }
60 }
61
62 public IView View { get; set; }
63
64 [Dynamic]
65 public object ViewBag
66 {
67 [return: Dynamic]
68 get
69 {
70 Func<ViewDataDictionary> viewDataThunk = null;
71 if (this._dynamicViewData == null)
72 {
73 if (viewDataThunk == null)
74 {
75 viewDataThunk = () => this.ViewData;
76 }
77 this._dynamicViewData = new DynamicViewDataDictionary(viewDataThunk);
78 }
79 return this._dynamicViewData;
80 }
81 }
82
83 public ViewDataDictionary ViewData
84 {
85 get
86 {
87 if (this._viewData == null)
88 {
89 this._viewData = new ViewDataDictionary();
90 }
91 return this._viewData;
92 }
93 set
94 {
95 this._viewData = value;
96 }
97 }
98
99 public ViewEngineCollection ViewEngineCollection
100 {
101 get =>
102 (this._viewEngineCollection ?? ViewEngines.Engines);
103 set
104 {
105 this._viewEngineCollection = value;
106 }
107 }
108
109 public string ViewName
110 {
111 get =>
112 (this._viewName ?? string.Empty);
113 set
114 {
115 this._viewName = value;
116 }
117 }
118 }
1.2.10 FileContentResult
功能：将二进制文件的内容发送到响应
定义：
1 public class FileContentResult : FileResult
2 {
3 // Methods
4 public FileContentResult(byte[] fileContents, string contentType) : base(contentType)
5 {
6 if (fileContents == null)
7 {
8 throw new ArgumentNullException("fileContents");
9 }
10 this.FileContents = fileContents;
11 }
12
13 protected override void WriteFile(HttpResponseBase response)
14 {
15 response.OutputStream.Write(this.FileContents, 0, this.FileContents.Length);
16 }
17
18 // Properties
19 public byte[] FileContents { get; private set; }
20 }
1.2.11 FilePathResult
功能：将文件的内容发送到响应。
定义：
1 public class FilePathResult : FileResult
2 {
3 // Methods
4 public FilePathResult(string fileName, string contentType) : base(contentType)
5 {
6 if (string.IsNullOrEmpty(fileName))
7 {
8 throw new ArgumentException(MvcResources.Common_NullOrEmpty, "fileName");
9 }
10 this.FileName = fileName;
11 }
12
13 protected override void WriteFile(HttpResponseBase response)
14 {
15 response.TransmitFile(this.FileName);
16 }
17
18 // Properties
19 public string FileName { get; private set; }
20 }
1.2.12 FilestreamResult
功能：使用Stream实例将二进制内容发送到响应。
定义：
1 public class FileStreamResult : FileResult
2 {
3 // Fields
4 private const int BufferSize = 0x1000;
5
6 // Methods
7 public FileStreamResult(Stream fileStream, string contentType) : base(contentType)
8 {
9 if (fileStream == null)
10 {
11 throw new ArgumentNullException("fileStream");
12 }
13 this.FileStream = fileStream;
14 }
15
16 protected override void WriteFile(HttpResponseBase response)
17 {
18 Stream outputStream = response.OutputStream;
19 using (this.FileStream)
20 {
21 byte[] buffer = new byte[0x1000];
22 while (true)
23 {
24 int count = this.FileStream.Read(buffer, 0, 0x1000);
25 if (count == 0)
26 {
27 return;
28 }
29 outputStream.Write(buffer, 0, count);
30 }
31 }
32 }
33
34 // Properties
35 public Stream FileStream { get; private set; }
36 }
1.2.13 ViewResult
功能：表示一个类，该类用于使用由IViewEngine对象返回的IView实例来呈现视图。
(1)定义：
1 public class ViewResult : ViewResultBase
2 {
3 // Fields
4 private string _masterName;
5
6 // Methods
7 protected override ViewEngineResult FindView(ControllerContext context)
8 {
9 ViewEngineResult result = base.ViewEngineCollection.FindView(context, base.ViewName, this.MasterName);
10 if (result.View != null)
11 {
12 return result;
13 }
14 StringBuilder builder = new StringBuilder();
15 foreach (string str in result.SearchedLocations)
16 {
17 builder.AppendLine();
18 builder.Append(str);
19 }
20 throw new InvalidOperationException(string.Format(CultureInfo.CurrentCulture, MvcResources.Common_ViewNotFound, new object[] { base.ViewName, builder }));
21 }
22
23 // Properties
24 public string MasterName
25 {
26 get =>
27 (this._masterName ?? string.Empty);
28 set
29 {
30 this._masterName = value;
31 }
32 }
33 }
1.2.14 PartialResult
功能：表示一个用于将分部视图发送到响应的基类。
(1)定义：
1 public class PartialViewResult : ViewResultBase
2 {
3 // Methods
4 protected override ViewEngineResult FindView(ControllerContext context)
5 {
6 ViewEngineResult result = base.ViewEngineCollection.FindPartialView(context, base.ViewName);
7 if (result.View != null)
8 {
9 return result;
10 }
11 StringBuilder builder = new StringBuilder();
12 foreach (string str in result.SearchedLocations)
13 {
14 builder.AppendLine();
15 builder.Append(str);
16 }
17 throw new InvalidOperationException(string.Format(CultureInfo.CurrentCulture, MvcResources.Common_PartialViewNotFound, new object[] { base.ViewName, builder }));
18 }
19 }
2 ActionResult自定义扩展
关于ActionResult的自定义扩展，满足两个条件
(1)继承ActionResult
(2)重写ExecuteResult()方法
2.1 XMLResult
public class XmlResult : ActionResult
{
private object _data;
public XmlResult(object data)
{
_data = data;
}
public override void ExecuteResult(ControllerContext context)
{
var serializer = new XmlSerializer(_data.GetType());
var response = context.HttpContext.Response;
response.ContentType = "text/xml";
serializer.Serialize(response.Output, _data);
}
}
Controller
public XmlResult GetEmpInfo()
{
EmpInfo empInfo = new EmpInfo()
{
Name = "Alan_beijing",
Address = "China-ShangHai",
Age=40
};
return new XmlResult(empInfo);
}
Test Result
2.2 CsvResult
public class CsvResult : FileResult
{
private IEnumerable _data;
public CsvResult(IEnumerable data, string fileName) : base("text/csv")
{
_data = data;
FileDownloadName = fileName;
}
protected override void WriteFile(HttpResponseBase response)
{
var builder = new StringBuilder();
var strWriter = new StringWriter(builder);
foreach (var item in _data)
{
var properties = item.GetType().GetProperties();
foreach (var prop in properties)
{
strWriter.Write(GetValue(item, prop.Name));
strWriter.Write(", ");
}
strWriter.WriteLine();
}
response.Write(builder);
}
public static string GetValue(object item, string propName)
{
return item.GetType().GetProperty(propName).GetValue(item, null).ToString() ?? "";
}
}
Controller
public CsvResult DownCsvEmpInfo()
{
EmpInfo empInfo = new EmpInfo()
{
Name = "Alan_beijing",
Address = "China-ShangHai",
Age = 40
};
return new CsvResult(new List<EmpInfo>() { empInfo }, "empInfo");
}
测试结果
四 推荐网址
【01】https://msdn.microsoft.com/zh-cn/library/system.web.mvc.actionresult(v=vs.118).aspx
五 后续
敬请等待下一篇......
六 服务区
有喜欢的朋友，可以看一下，不喜欢的的朋友，勿喷，谢谢！！