c# - 类、结构或接口成员声明中的无效标记“=”，类、结构或接口成员声明中的无效标记“（”

Question

我想返回存储在数据库中的最后一条记录，并希望将该返回值实例化到类 ReligionCaste 的成员 pID，但我有标题错误。

我的数据库功能是

public int LastEnteredRecord()
    {
        int lastId=0;
        dbConnection = new SqlConnection(connectionString);
        try    //If error in connection opening, throws it.
        {
            dbConnection.Open();
            command.Connection = dbConnection;
            command.CommandType = CommandType.StoredProcedure;
            command.CommandText = "dbo.LastRecordEntered";


            try    //if error in query execution, throws it.
            {
                lastId= Convert.ToInt32 ( command.ExecuteScalar());
               // MessageBox.Show("Record Entered with ID:"+lastId .ToString ());
            }
            catch (SqlException ex)
            {
                MessageBox.Show(ex.Message);

            }
            dbConnection.Close();
            dbConnection.Dispose();
        }
        catch (SqlException ex)
        {
            MessageBox.Show(ex.Message);

        }
        return lastId;
    }  

我想将该返回值分配给代码为的类

class ReligionCaste
{
    //public int religion_ID, caste_ID;
    public String religion, sect, caste, subCaste;
    public int pID;

    DatabaseHandler.DBCntrlr dbObj = new DatabaseHandler.DBCntrlr();
    pID = dbObj.LastEnteredRecord();

 }

但它给出了上述错误。

Answer 1

您需要一个构造函数来为 pId 赋值，此时您的语法无效。例子：

class ReligionCaste
{
    public ReligionCaste()
    {
        pID = dbObj.LastEnteredRecord();
    }

    //public int religion_ID, caste_ID;
    public String religion, sect, caste, subCaste;
    public int pID;

    DatabaseHandler.DBCntrlr dbObj = new DatabaseHandler.DBCntrlr();
 }

Answer 2

class ReligionCaste
{
    //public int religion_ID, caste_ID;
    public String religion, sect, caste, subCaste;
    public int pID;
    private DatabaseHandler.DBCntrlr dbObj;

    public ReligionCaste()
    {
        dbObj = new DatabaseHandler.DBCntrlr();
        pID = dbObj.LastEnteredRecord();
    }  
 }