如何返回字符串web方法webservice错误请帮帮我？ [英] How to return into string web method webservice error please help me?

问题描述

how to return into  void web method webservice error please help me?

<pre>[WebMethod]
    public void GetDaywiseData(string dep)
    {
        
        try
        {
             List<DataBind.DaywiseBind> binddata = new List<DataBind.DaywiseBind>();  
            string cs = ConfigurationManager.ConnectionStrings["sa"].ConnectionString;  
            using (SqlConnection con = new SqlConnection(cs))  
            {  
                SqlCommand cmd = new SqlCommand();  
                cmd.Connection = con;  
                cmd.CommandType = System.Data.CommandType.Text;
                cmd.CommandText = " select  a.doctor_nm AS DOCTORNAME,[dbo].[fn_docdays](doc_id) as DAYS,b.dept_nm AS DEPARTMENT from (select * from doctor_master) as a inner join (select * from deptmaster)as b on a.dept_cd = b.dept_cd where b.dept_nm = '"+dep+"'";  
                con.Open();  
                SqlDataReader rdr = cmd.ExecuteReader();  
                while (rdr.Read())  
                {  
                    DataBind.DaywiseBind getdata = new DataBind.DaywiseBind();  
                   
                   getdata.doctorname = rdr["DOCTORNAME"].ToString();
                   getdata.days = rdr["DAYS"].ToString();
                   getdata.department = rdr["DEPARTMENT"].ToString();
                   binddata.Add(getdata);  
                }  
            }  
  
            JavaScriptSerializer js = new JavaScriptSerializer();
            Context.Response.Write(js.Serialize(binddata));
           
        }  
        catch(Exception exc)
        {
               // MessageBox.Show("An error happened while processing your call");
            
           
        }

我尝试过：

What I have tried:

i have bind gridview when consume webservice pass parameter value(dep) Error Cannot implicitly convert type 'void' to 'object' 

ServiceReference2.GMCHWebServiceSoapClient srv = new ServiceReference2.GMCHWebServiceSoapClient();

        //  var getdata = srv.GetDaywiseData(dep1);


          grdshowdata.DataSource = srv.GetDaywiseData(dep1); //error
          grdshowdata.DataBind();

推荐答案

您的方法签名不返回值，因此您无法检索字符串。

方法签名是以下部分...

Your method signature does not return a value, hence you cannot retrieve a string.
The method signature is the below part...

public void GetDaywiseData(string dep)

关键字 void 表示不返回值 - 在VB6中，这称为Sub。

要返回值，您将更改方法签名以标识返回值的类型 - 以下返回字符串值;

The keyword void means that a value will not be returned - in VB6 this is known as a Sub.
To return a value you would change your method signature to identify the type of return value - the below returns a string value;

public string GetDaywiseData(string dep)

根据上面的代码，最简单的解决方案如下：

Based on the code above, the easiest solution is as follows;

[WebMethod]
public DataTable GetDaywiseData(string dep)
{    
    try
    {         
        DataTable dtReturn;
        string cs = ConfigurationManager.ConnectionStrings["sa"].ConnectionString;  

        using (SqlConnection con = new SqlConnection(cs))  
        {  
            SqlCommand cmd = new SqlCommand();  
            cmd.Connection = con;  
            cmd.CommandType = System.Data.CommandType.Text;
            cmd.CommandText = " select  a.doctor_nm AS DOCTORNAME,[dbo].[fn_docdays](doc_id) as DAYS,b.dept_nm AS DEPARTMENT from (select * from doctor_master) as a inner join (select * from deptmaster)as b on a.dept_cd = b.dept_cd where b.dept_nm = '"+dep+"'";  
            con.Open();  
            SqlDataAdapter adap = new SqlDataAdapter(cmd);
            adap.Fill(dtReturn);
            
        } 
    return dtReturn;
}

数据表将从WebService返回，然后将其设置为Grid的数据源



亲切的问候

The datatable will be returned from the WebService, which is then set as the datasource of your Grid

Kind Regards

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