webservice支持httpget及post方法

1.在web.config中节点system.web添加

    <webServices>
      <protocols>
        <add name="HttpGet" />
        <add name="HttpPost" />
      </protocols>
    </webServices>

2.在调用类添加特性

[System.Web.Script.Services.ScriptService]

3.在调用方法添加特性

[WebMethod,ScriptMethod(ResponseFormat = ResponseFormat.Json, UseHttpGet = false)]

我这边测试ScriptMethod特性可不加，并且暂时无法指定方法只能使用POST模式，不知哪位指导下。

调用的话，示例：http://localhost:26813/WebService/xxxx.asmx/GetTest?inputStr=1

并且在config中添加HttpGet及HttpPost方式访问后，会使全部接口都变成可以使用http方法调用，若有影响请慎用。

解决返回json字符串时多出一个{“d”:null}字符串方案：

可以参考连接去看看吧

下面纯属复制：

添加文件MyModule：

    public class MyModule : IHttpModule
    {
        public void Dispose()
        {
        }

        public void Init(HttpApplication context)
        {
            context.BeginRequest += new EventHandler(Application_BeginRequest);
        }

        public void Application_BeginRequest(object sender, EventArgs e)
        {
            HttpApplication application = sender as HttpApplication;
            string extension = Path.GetExtension(application.Request.Path);
            //这边我进行一个筛选
            if (application.Request.Path.IndexOf(".asmx/SendPatientDischargeInfo") > -1)
            {
                application.Response.Filter = new CatchTextStream(application.Response.Filter);
            }
        }
    }

    public class CatchTextStream : Stream
    {
        #region 数据流
        /// <summary>
        /// 数据流
        /// </summary>
        private readonly Stream output;
        #endregion
        #region 构造函数
        public CatchTextStream(Stream s)
        {
            output = s;
        }
        #endregion
        #region 重载属性及方法
        public override bool CanRead => output.CanRead;

        public override bool CanSeek => output.CanSeek;

        public override bool CanWrite => output.CanWrite;

        public override void Flush()
        {
            output.Flush();
        }
        public override long Length => output.Length;

        public override long Position
        {
            get => output.Position;
            set => output.Position = value;
        }
        public override int Read(byte[] buffer, int offset, int count)
        {
            return output.Read(buffer, offset, count);
        }
        public override long Seek(long offset, SeekOrigin origin)
        {
            return output.Seek(offset, origin);
        }
        public override void SetLength(long value)
        {
            output.SetLength(value);
        }
        public override void Write(byte[] buffer, int offset, int count)
        {
            if (HttpContext.Current != null)
            {
                HttpContext context = HttpContext.Current;
                Encoding encoding = context.Response.ContentEncoding;
                string responseInfo = encoding.GetString(buffer, offset, count);
                responseInfo = responseInfo.Replace("{"d":null}", "");
                //responseInfo = responseInfo.Substring(0, responseInfo.Length - 9);
                buffer = encoding.GetBytes(responseInfo);
                output.Write(buffer, 0, buffer.Length);
            }
        }
        #endregion
    }

并在web.config中system.webServer节点下的modules节点添加：

<add name="MyModule" type="命名空间.MyModule"/>

在Write方法中替换字符串。