Question

I have the following struct in C# class

public struct Employee
        {
            public const string EMPID = "EMP_ID";
            public const string FName = "FIRST_NAME";
            public const string LNAME = "LAST_NAME";
            public const string DEPTID = "DEPT_ID";

        }

Is there an easy way to build a string as follows

const string mainquery="INSERT INTO EMP(EMP_ID,FIRST_NAME,LAST_NAME,DEPT_ID) VALUES(:EMP_ID,:FIRST_NAME,:LAST_NAME,:DEPT_ID)"

Instead of doing as follows
and then concatenating it.

const string EMP_COLS=
                EMPLOYEE.EMPID + "," +
                EMPLOYEE.FNAME + "," +
        EMPLOYEE.LNAME + "," +
                EMPLOYEE.DEPTID;

            const string EMP_Values=
                EMPLOYEE.EMPID + ":" +
                EMPLOYEE.FNAME + ":" +
        EMPLOYEE.LNAME + ":" +
                EMPLOYEE.DEPTID;

Answer 1

You could try something like this:

StringBuilder sb = new StringBuilder();
var fields = typeof(Employee).GetFields();
for (int i = 0; i < fields.Length; ++i)
{
    sb.Append(fields[i].GetValue(new Employee()));
    if (i < fields.Length - 1)
    {
        sb.Append(',');
    }
}

string result = sb.ToString();
// The above will be "EMP_ID,FIRST_NAME,LAST_NAME,DEPT_ID"

Edit: Note that above I’m assuming you’ve got using directives for both System.Reflection and System.Text.