.NetCore2.1 WebAPI 根據swagger.json自動生成客戶端代碼
阿新 • • 發佈：2018-07-12
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前言
上一篇博客中我們可以得知通過Swagger插件可以很方便的提供給接口開發者在線調試，但是實際上Swagger附帶的功能還有很多，
比如使用NSwag生成客戶端調用代碼，進一步解放接口開發者。
NSwag
NSwag是一個發布在GitHub上的開源項目，它可以根據Swagger說明頁上的swagger.json文件生成C#、TypeScript客戶端代碼。
NSwag的項目地址:https://github.com/RSuter/NSwag
Nswag提供4種代碼生成方法
1、使用 NSwagStudio，這是一款 Windows 桌面應用，用於在 C# 和 TypeScript 中為 API 生成客戶端代碼。
2、使用 NSwag.CodeGeneration.CSharp 或 NSwag.CodeGeneration.TypeScript NuGet 包在項目中執行代碼生成。
3、使用命令行中的 NSwag。
4、使用 NSwag.MSBuild NuGet 包。
這裏推薦使用NSwagStudio，可以從GitHub上下載該工具，地址:https://github.com/RSuter/NSwag/wiki/NSwagStudio
下載後開始安裝，安裝完畢後打開NSwagStudio，如下圖，在左側選擇Tab頁菜單裏選擇Documents
如上圖框框選中的幾點，我們需要留意。其中Swagger Specification URL就是我們WebAPI的swagger.json的在線地址。
如果點擊【Create local Copy 】按鈕時你的WebAPI未在線則代碼生成工具會彈出錯誤對話框，如下圖:
所以采取讀取Swagger Specification URL 方式進行生成代碼的前提條件是你必須保證swagger.json文件能在線讀取！
其次你可以選擇RunTime（運行時），這裏應該是服務端WebAPI的運行時(畢竟TypeScript是不關心你服務端是.NET Core還是.NET Framework).
因為我的環境是.NET Core2.1，所以這裏選擇NET Core21。
接下來，點擊【Create local Copy】按鈕，點擊後NSwagStudio會與WebAPI服務端進行交互，成功後會將swagger.json文件格式化到左邊的文本編輯器中，如下圖:
此時，你可以在右側的Outputs中勾選你需要輸出的文件格式，這裏我選擇TypeScript和CSharp Client，
這個地方有個C# WebAPI Controller，我有點納悶，我都有swagger.json文件了絕壁是已經存在webapi了，
沒有必要反向再去生成一遍webapi的控制器啦。 不懂，反正只管生成客戶端代碼就好。
我們勾選好後下面就會出現相應的輸出配合頁面，如下圖:
我們選擇CSharp Client頁面，該頁面左側分為Setting和Output兩個頁面，Setting頁可以對輸出的cs文件進行配置，如命名空間、類名稱、輸出文件路徑等等(很多配置我也不會....)
我們點擊【Generate Outputs】後NSwagStudio會根據配置生成客戶端操作類，在Output頁面即可檢查，檢查無誤後再點擊【Generate Files】可將類文件導出到配置的輸出目錄。
TypeScript亦是如此，同時NSwagStudio也可支持加載DLL反射生成，具體方法可根據官網操作(畢竟可以直接使用json文件在線生成沒必要再自己手工選擇dll..)
這裏截圖看SwagerUI頁和NSwagStudio生成後的客戶端cs文件
生成的客戶端C#代碼：
//----------------------
// <auto-generated>
// Generated using the NSwag toolchain v11.17.19.0 (NJsonSchema v9.10.58.0 (Newtonsoft.Json v9.0.0.0)) (http://NSwag.org)
// </auto-generated>
//----------------------
namespace Test
{
#pragma warning disable // Disable all warnings
[System.CodeDom.Compiler.GeneratedCode("NSwag", "11.17.19.0 (NJsonSchema v9.10.58.0 (Newtonsoft.Json v9.0.0.0))")]
public partial class Client
{
private string _baseUrl = "http://localhost:58985";
private System.Lazy<Newtonsoft.Json.JsonSerializerSettings> _settings;
public Client()
{
_settings = new System.Lazy<Newtonsoft.Json.JsonSerializerSettings>(() =>
{
var settings = new Newtonsoft.Json.JsonSerializerSettings();
UpdateJsonSerializerSettings(settings);
return settings;
});
}
public string BaseUrl
{
get { return _baseUrl; }
set { _baseUrl = value; }
}
protected Newtonsoft.Json.JsonSerializerSettings JsonSerializerSettings { get { return _settings.Value; } }
partial void UpdateJsonSerializerSettings(Newtonsoft.Json.JsonSerializerSettings settings);
partial void PrepareRequest(System.Net.Http.HttpClient client, System.Net.Http.HttpRequestMessage request, string url);
partial void PrepareRequest(System.Net.Http.HttpClient client, System.Net.Http.HttpRequestMessage request, System.Text.StringBuilder urlBuilder);
partial void ProcessResponse(System.Net.Http.HttpClient client, System.Net.Http.HttpResponseMessage response);
/// <summary>巴拉巴拉</summary>
/// <returns>Success</returns>
/// <exception cref="SwaggerException">A server side error occurred.</exception>
public System.Threading.Tasks.Task ApiTestGetAsync()
{
return ApiTestGetAsync(System.Threading.CancellationToken.None);
}
/// <summary>巴拉巴拉</summary>
/// <returns>Success</returns>
/// <exception cref="SwaggerException">A server side error occurred.</exception>
/// <param name="cancellationToken">A cancellation token that can be used by other objects or threads to receive notice of cancellation.</param>
public async System.Threading.Tasks.Task ApiTestGetAsync(System.Threading.CancellationToken cancellationToken)
{
var urlBuilder_ = new System.Text.StringBuilder();
urlBuilder_.Append(BaseUrl != null ? BaseUrl.TrimEnd(‘/‘) : "").Append("/api/Test");
var client_ = new System.Net.Http.HttpClient();
try
{
using (var request_ = new System.Net.Http.HttpRequestMessage())
{
request_.Method = new System.Net.Http.HttpMethod("GET");
PrepareRequest(client_, request_, urlBuilder_);
var url_ = urlBuilder_.ToString();
request_.RequestUri = new System.Uri(url_, System.UriKind.RelativeOrAbsolute);
PrepareRequest(client_, request_, url_);
var response_ = await client_.SendAsync(request_, System.Net.Http.HttpCompletionOption.ResponseHeadersRead, cancellationToken).ConfigureAwait(false);
try
{
var headers_ = System.Linq.Enumerable.ToDictionary(response_.Headers, h_ => h_.Key, h_ => h_.Value);
if (response_.Content != null && response_.Content.Headers != null)
{
foreach (var item_ in response_.Content.Headers)
headers_[item_.Key] = item_.Value;
}
ProcessResponse(client_, response_);
var status_ = ((int)response_.StatusCode).ToString();
if (status_ == "200")
{
return;
}
else
if (status_ != "200" && status_ != "204")
{
var responseData_ = response_.Content == null ? null : await response_.Content.ReadAsStringAsync().ConfigureAwait(false);
throw new SwaggerException("The HTTP status code of the response was not expected (" + (int)response_.StatusCode + ").", (int)response_.StatusCode, responseData_, headers_, null);
}
}
finally
{
if (response_ != null)
response_.Dispose();
}
}
}
finally
{
if (client_ != null)
client_.Dispose();
}
}
/// <returns>Success</returns>
/// <exception cref="SwaggerException">A server side error occurred.</exception>
public System.Threading.Tasks.Task ApiTestPostAsync(string value)
{
return ApiTestPostAsync(value, System.Threading.CancellationToken.None);
}
/// <returns>Success</returns>
/// <exception cref="SwaggerException">A server side error occurred.</exception>
/// <param name="cancellationToken">A cancellation token that can be used by other objects or threads to receive notice of cancellation.</param>
public async System.Threading.Tasks.Task ApiTestPostAsync(string value, System.Threading.CancellationToken cancellationToken)
{
var urlBuilder_ = new System.Text.StringBuilder();
urlBuilder_.Append(BaseUrl != null ? BaseUrl.TrimEnd(‘/‘) : "").Append("/api/Test");
var client_ = new System.Net.Http.HttpClient();
try
{
using (var request_ = new System.Net.Http.HttpRequestMessage())
{
var content_ = new System.Net.Http.StringContent(Newtonsoft.Json.JsonConvert.SerializeObject(value, _settings.Value));
content_.Headers.ContentType = System.Net.Http.Headers.MediaTypeHeaderValue.Parse("multipart/form-data");
request_.Content = content_;
request_.Method = new System.Net.Http.HttpMethod("POST");
PrepareRequest(client_, request_, urlBuilder_);
var url_ = urlBuilder_.ToString();
request_.RequestUri = new System.Uri(url_, System.UriKind.RelativeOrAbsolute);
PrepareRequest(client_, request_, url_);
var response_ = await client_.SendAsync(request_, System.Net.Http.HttpCompletionOption.ResponseHeadersRead, cancellationToken).ConfigureAwait(false);
try
{
var headers_ = System.Linq.Enumerable.ToDictionary(response_.Headers, h_ => h_.Key, h_ => h_.Value);
if (response_.Content != null && response_.Content.Headers != null)
{
foreach (var item_ in response_.Content.Headers)
headers_[item_.Key] = item_.Value;
}
ProcessResponse(client_, response_);
var status_ = ((int)response_.StatusCode).ToString();
if (status_ == "200")
{
return;
}
else
if (status_ != "200" && status_ != "204")
{
var responseData_ = response_.Content == null ? null : await response_.Content.ReadAsStringAsync().ConfigureAwait(false);
throw new SwaggerException("The HTTP status code of the response was not expected (" + (int)response_.StatusCode + ").", (int)response_.StatusCode, responseData_, headers_, null);
}
}
finally
{
if (response_ != null)
response_.Dispose();
}
}
}
finally
{
if (client_ != null)
client_.Dispose();
}
}
/// <summary>我是get測試</summary>
/// <returns>Success</returns>
/// <exception cref="SwaggerException">A server side error occurred.</exception>
public System.Threading.Tasks.Task<string> ApiTestByIdGetAsync(int id)
{
return ApiTestByIdGetAsync(id, System.Threading.CancellationToken.None);
}
/// <summary>我是get測試</summary>
/// <returns>Success</returns>
/// <exception cref="SwaggerException">A server side error occurred.</exception>
/// <param name="cancellationToken">A cancellation token that can be used by other objects or threads to receive notice of cancellation.</param>
public async System.Threading.Tasks.Task<string> ApiTestByIdGetAsync(int id, System.Threading.CancellationToken cancellationToken)
{
if (id == null)
throw new System.ArgumentNullException("id");
var urlBuilder_ = new System.Text.StringBuilder();
urlBuilder_.Append(BaseUrl != null ? BaseUrl.TrimEnd(‘/‘) : "").Append("/api/Test/{id}");
urlBuilder_.Replace("{id}", System.Uri.EscapeDataString(ConvertToString(id, System.Globalization.CultureInfo.InvariantCulture)));
var client_ = new System.Net.Http.HttpClient();
try
{
using (var request_ = new System.Net.Http.HttpRequestMessage())
{
request_.Method = new System.Net.Http.HttpMethod("GET");
request_.Headers.Accept.Add(new System.Net.Http.Headers.MediaTypeWithQualityHeaderValue("application/json"));
PrepareRequest(client_, request_, urlBuilder_);
var url_ = urlBuilder_.ToString();
request_.RequestUri = new System.Uri(url_, System.UriKind.RelativeOrAbsolute);
PrepareRequest(client_, request_, url_);
var response_ = await client_.SendAsync(request_, System.Net.Http.HttpCompletionOption.ResponseHeadersRead, cancellationToken).ConfigureAwait(false);
try
{
var headers_ = System.Linq.Enumerable.ToDictionary(response_.Headers, h_ => h_.Key, h_ => h_.Value);
if (response_.Content != null && response_.Content.Headers != null)
{
foreach (var item_ in response_.Content.Headers)
headers_[item_.Key] = item_.Value;
}
ProcessResponse(client_, response_);
var status_ = ((int)response_.StatusCode).ToString();
if (status_ == "200")
{
var responseData_ = response_.Content == null ? null : await response_.Content.ReadAsStringAsync().ConfigureAwait(false);
var result_ = default(string);
try
{
result_ = Newtonsoft.Json.JsonConvert.DeserializeObject<string>(responseData_, _settings.Value);
return result_;
}
catch (System.Exception exception_)
{
throw new SwaggerException("Could not deserialize the response body.", (int)response_.StatusCode, responseData_, headers_, exception_);
}
}
else
if (status_ != "200" && status_ != "204")
{
var responseData_ = response_.Content == null ? null : await response_.Content.ReadAsStringAsync().ConfigureAwait(false);
throw new SwaggerException("The HTTP status code of the response was not expected (" + (int)response_.StatusCode + ").", (int)response_.StatusCode, responseData_, headers_, null);
}
return default(string);
}
finally
{
if (response_ != null)
response_.Dispose();
}
}
}
finally
{
if (client_ != null)
client_.Dispose();
}
}
/// <returns>Success</returns>
/// <exception cref="SwaggerException">A server side error occurred.</exception>
public System.Threading.Tasks.Task ApiTestByIdPutAsync(int id, string value)
{
return ApiTestByIdPutAsync(id, value, System.Threading.CancellationToken.None);
}
/// <returns>Success</returns>
/// <exception cref="SwaggerException">A server side error occurred.</exception>
/// <param name="cancellationToken">A cancellation token that can be used by other objects or threads to receive notice of cancellation.</param>
public async System.Threading.Tasks.Task ApiTestByIdPutAsync(int id, string value, System.Threading.CancellationToken cancellationToken)
{
if (id == null)
throw new System.ArgumentNullException("id");
var urlBuilder_ = new System.Text.StringBuilder();
urlBuilder_.Append(BaseUrl != null ? BaseUrl.TrimEnd(‘/‘) : "").Append("/api/Test/{id}");
urlBuilder_.Replace("{id}", System.Uri.EscapeDataString(ConvertToString(id, System.Globalization.CultureInfo.InvariantCulture)));
var client_ = new System.Net.Http.HttpClient();
try
{
using (var request_ = new System.Net.Http.HttpRequestMessage())
{
var content_ = new System.Net.Http.StringContent(Newtonsoft.Json.JsonConvert.SerializeObject(value, _settings.Value));
content_.Headers.ContentType = System.Net.Http.Headers.MediaTypeHeaderValue.Parse("multipart/form-data");
request_.Content = content_;
request_.Method = new System.Net.Http.HttpMethod("PUT");
PrepareRequest(client_, request_, urlBuilder_);
var url_ = urlBuilder_.ToString();
request_.RequestUri = new System.Uri(url_, System.UriKind.RelativeOrAbsolute);
PrepareRequest(client_, request_, url_);
var response_ = await client_.SendAsync(request_, System.Net.Http.HttpCompletionOption.ResponseHeadersRead, cancellationToken).ConfigureAwait(false);
try
{
var headers_ = System.Linq.Enumerable.ToDictionary(response_.Headers, h_ => h_.Key, h_ => h_.Value);
if (response_.Content != null && response_.Content.Headers != null)
{
foreach (var item_ in response_.Content.Headers)
headers_[item_.Key] = item_.Value;
}
ProcessResponse(client_, response_);
var status_ = ((int)response_.StatusCode).ToString();
if (status_ == "200")
{
return;
}
else
if (status_ != "200" && status_ != "204")
{
var responseData_ = response_.Content == null ? null : await response_.Content.ReadAsStringAsync().ConfigureAwait(false);
throw new SwaggerException("The HTTP status code of the response was not expected (" + (int)response_.StatusCode + ").", (int)response_.StatusCode, responseData_, headers_, null);
}
}
finally
{
if (response_ != null)
response_.Dispose();
}
}
}
finally
{
if (client_ != null)
client_.Dispose();
}
}
/// <summary>小魔仙</summary>
/// <returns>Success</returns>
/// <exception cref="SwaggerException">A server side error occurred.</exception>
public System.Threading.Tasks.Task ApiTestByIdDeleteAsync(int id)
{
return ApiTestByIdDeleteAsync(id, System.Threading.CancellationToken.None);
}
/// <summary>小魔仙</summary>
/// <returns>Success</returns>
/// <exception cref="SwaggerException">A server side error occurred.</exception>
/// <param name="cancellationToken">A cancellation token that can be used by other objects or threads to receive notice of cancellation.</param>
public async System.Threading.Tasks.Task ApiTestByIdDeleteAsync(int id, System.Threading.CancellationToken cancellationToken)
{
if (id == null)
throw new System.ArgumentNullException("id");
var urlBuilder_ = new System.Text.StringBuilder();
urlBuilder_.Append(BaseUrl != null ? BaseUrl.TrimEnd(‘/‘) : "").Append("/api/Test/{id}");
urlBuilder_.Replace("{id}", System.Uri.EscapeDataString(ConvertToString(id, System.Globalization.CultureInfo.InvariantCulture)));
var client_ = new System.Net.Http.HttpClient();
try
{
using (var request_ = new System.Net.Http.HttpRequestMessage())
{
request_.Method = new System.Net.Http.HttpMethod("DELETE");
PrepareRequest(client_, request_, urlBuilder_);
var url_ = urlBuilder_.ToString();
request_.RequestUri = new System.Uri(url_, System.UriKind.RelativeOrAbsolute);
PrepareRequest(client_, request_, url_);
var response_ = await client_.SendAsync(request_, System.Net.Http.HttpCompletionOption.ResponseHeadersRead, cancellationToken).ConfigureAwait(false);
try
{
var headers_ = System.Linq.Enumerable.ToDictionary(response_.Headers, h_ => h_.Key, h_ => h_.Value);
if (response_.Content != null && response_.Content.Headers != null)
{
foreach (var item_ in response_.Content.Headers)
headers_[item_.Key] = item_.Value;
}
ProcessResponse(client_, response_);
var status_ = ((int)response_.StatusCode).ToString();
if (status_ == "200")
{
return;
}
else
if (status_ != "200" && status_ != "204")
{
var responseData_ = response_.Content == null ? null : await response_.Content.ReadAsStringAsync().ConfigureAwait(false);
throw new SwaggerException("The HTTP status code of the response was not expected (" + (int)response_.StatusCode + ").", (int)response_.StatusCode, responseData_, headers_, null);
}
}
finally
{
if (response_ != null)
response_.Dispose();
}
}
}
finally
{
if (client_ != null)
client_.Dispose();
}
}
private string ConvertToString(object value, System.Globalization.CultureInfo cultureInfo)
{
if (value is System.Enum)
{
string name = System.Enum.GetName(value.GetType(), value);
if (name != null)
{
var field = System.Reflection.IntrospectionExtensions.GetTypeInfo(value.GetType()).GetDeclaredField(name);
if (field != null)
{
var attribute = System.Reflection.CustomAttributeExtensions.GetCustomAttribute(field, typeof(System.Runtime.Serialization.EnumMemberAttribute))
as System.Runtime.Serialization.EnumMemberAttribute;
if (attribute != null)
{
return attribute.Value;
}
}
}
}
else if (value is byte[])
{
return System.Convert.ToBase64String((byte[]) value);
}
else if (value != null && value.GetType().IsArray)
{
var array = System.Linq.Enumerable.OfType<object>((System.Array) value);
return string.Join(",", System.Linq.Enumerable.Select(array, o => ConvertToString(o, cultureInfo)));
}
return System.Convert.ToString(value, cultureInfo);
}
}
[System.CodeDom.Compiler.GeneratedCode("NSwag", "11.17.19.0 (NJsonSchema v9.10.58.0 (Newtonsoft.Json v9.0.0.0))")]
public partial class SwaggerException : System.Exception
{
public int StatusCode { get; private set; }
public string Response { get; private set; }
public System.Collections.Generic.Dictionary<string, System.Collections.Generic.IEnumerable<string>> Headers { get; private set; }
public SwaggerException(string message, int statusCode, string response, System.Collections.Generic.Dictionary<string, System.Collections.Generic.IEnumerable<string>> headers, System.Exception innerException)
: base(message, innerException)
{
StatusCode = statusCode;
Response = response;
Headers = headers;
}
public override string ToString()
{
return string.Format("HTTP Response: \n\n{0}\n\n{1}", Response, base.ToString());
}
}
[System.CodeDom.Compiler.GeneratedCode("NSwag", "11.17.19.0 (NJsonSchema v9.10.58.0 (Newtonsoft.Json v9.0.0.0))")]
public partial class SwaggerException<TResult> : SwaggerException
{
public TResult Result { get; private set; }
public SwaggerException(string message, int statusCode, string response, System.Collections.Generic.Dictionary<string, System.Collections.Generic.IEnumerable<string>> headers, TResult result, System.Exception innerException)
: base(message, statusCode, response, headers, innerException)
{
Result = result;
}
}
}
結語
不得不贊嘆Swagger的強大，它的出現解放了多少程序員啊，後續但凡有客戶端碼農說不會調用哥的API，哥都可以直接給他代碼生成器生成的代碼，一個字：爽。
.NetCore2.1 WebAPI 根據swagger.json自動生成客戶端代碼