得到异常“并非所有代码路径都返回值". [英] Getting Exception "not all code path return a value"

问题描述

我有一种使用查询更新MySQL表的方法.我正在使用MS Visual Studio和phpmyadmin作为SQL客户端.

Hi I have a method which updates a MySQL table using a query. I'm using a MS Visual Studio and phpmyadmin as the SQL client.

方法:

public static Member updateMember(string un, string pass, string name, string surname,                 string mf, string dob, string add, string phone, string email)
    {




        MySqlConnection connection = new MySqlConnection(conn);
        MySqlCommand cmd;

        string query = "UPDATE MEMBER SET Name='" + un + "', Surname='" + surname + "',      MF='" + mf + "', DOB='" + dob + "', Address='" + add + "', PhoneNo='" + phone + "', EMail='" + email + "', UserName='" + un + "', Password='" + pass + "' ";


        tr y
        {


            connection.Open();
            cmd = connection.CreateCommand();
            cmd.CommandText = query;
            cmd.ExecuteNonQuery();
        }

        catch (Exception)
        {
            throw;
        }
        finally
        {
            if (connection.State == System.Data.ConnectionState.Open)
            {
                connection.Close();

            }
        }
    }

这是正在发生的事情.我将文本框中的某些值以字符串变量的形式存储.然后，我将这些字符串变量发送到此方法.我希望该方法可以捕获我的字符串变量，并使用变量的值更新我的SQL表.

Here is what's happening. I'm storing some values from TextBoxes in a form in string variables. Then I'm sending those string variables to this method. I want that this method grabs my string variables and update my SQL table with the values of my variables.

我遇到错误，并非所有代码路径都返回值.

I'm getting an error not all code paths return a value.

推荐答案

您的方法未返回任何内容，您需要返回成员对象.

Your method is not returning anything, You need to return the Member Object.

如果您不需要返回任何内容，只需像这样更改您的方法签名，

If you do not need to return anything , just change your Method Signature like this,

public static Void updateMember(string un, string pass, string name, string surname,string mf, string dob, string add, string phone, string email)

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