C# 使用web服务检索多个数据库列

我正在尝试使用web服务检索多个列的数据。下面的代码可以正常工作：

public string GetCustomerNameWithIDNumber(string id_number)
{
    string fullname ="";
    string id_type = "";
    string id_number = "";
    string dob = "";

    using (SqlConnection cn = new SqlConnection(constring))
    {
        cn.Open();
        string q = "select fullname, id_type, id_number, date_ofbirth from account_info where id_number = @id_number";

        using (SqlCommand cmd = new SqlCommand(q, cn))
        {
            cmd.Parameters.AddWithValue("@id_number", id_number);

            using (SqlDataReader rd = cmd.ExecuteReader())
            {
                while (rd.Read())
                {
                    fullname = rd["fullname"].ToString();
                    id_type = rd["id_type"].ToString();
                    id_number = rd["id_number"].ToString();
                    dob = rd["date_ofbirth"].ToString();
                    bvn2 = rd["bvn"].ToString();
                }
            }

            return fullname;
        }
    }
}

---

仅获取全名，现在假设我想获取不止一个数据库列的全名，我该怎么做？

您将需要返回一个类。我编写了一个简单的类来保存这些数据：

class Customer {
    public string FullName { get; set; }
    public string IdType { get; set; }
    public string IdNumber { get; set; }
    public string DateOfBirth { get; set; }
    public string Bvn { get; set; }
}

然后此方法返回该customer对象：

public Customer GetCustomerNameWithIDNumber(string id_number) {
    using (SqlConnection cn = new SqlConnection(constring)) {
        cn.Open();
        string q = "select fullname,id_type,id_number,date_ofbirth from account_info where id_number =@id_number";

        using (SqlCommand cmd = new SqlCommand(q, cn)) {
            cmd.Parameters.AddWithValue("@id_number", id_number);
            using (SqlDataReader rd = cmd.ExecuteReader()) {
                while (rd.Read()) {
                    return new Customer {
                        FullName = rd["fullname"].ToString(),
                        IdType= rd["id_type"].ToString(),
                        IdNumber = rd["id_number"].ToString(),
                        DateOfBirth = rd["date_ofbirth"].ToString(),
                        Bvn = rd["bvn"].ToString()
                    };
                }
            }
        }
    }
}

---

此代码将返回数据库中与

id\u编号匹配的第一个客户

表示无法将类型customer隐式转换为StringYou更新函数定义以返回

客户

。（此行<代码>公共客户GetCustomerNameWithIDNumber（字符串id\U编号）{）