设置对象变量时出现 StackOverflow 异常

Question

我正在尝试从 sql table 中提取数据，将其写入对象，然后将其放入列表中。我正在使用 VS2017、C# 和 MS-SQL 2008.

当我运行代码时，它从 SQL table 中提取数据；将它转储到一些变量中（我知道这不是最快的，我只是想确认我得到了它们），我实例化对象并尝试设置第一个值，然后我在设置操作中得到堆栈溢出。

为什么设置变量并打印到屏幕上很好，而不是将其放入变量中？

错误；

System.WhosebugException HResult=0x800703E9 Message=Exception of type 'System.WhosebugException' was thrown.

Class;

class Company
{
    public String MDWRowNumber { get => MDWRowNumber; set => MDWRowNumber = value; } //errors here on set => MDWRowNumber = value
    public String MDWIdNumber { get => MDWIdNumber; set => MDWIdNumber = value; }
    public String MDWCompanyName { get => MDWCompanyName; set => MDWCompanyName = value; }
}

主要；

sql = "SELECT RowNo, Id, Name FROM Company;";
command = new SqlCommand(sql, connection);
reader = command.ExecuteReader();

while (reader.Read())
{
    Console.WriteLine(reader.GetValue(0).ToString());
    Console.WriteLine(reader.GetValue(1).ToString());
    Console.WriteLine(reader.GetValue(2).ToString());

    a = reader.GetValue(0).ToString();
    b = reader.GetValue(1).ToString();
    c = reader.GetValue(2).ToString();

    Console.WriteLine(a + " | " + b + " | " + c); // writes correct values as expected

    Company company = new Company();
    company.MDWRowNumber = a; /////Errors here/////
    company.MDWIdNumber = b;
    company.MDWCompanyName = c;
    //Company company = new Company()
    //    {
    //        MDWRowNumber = reader.GetValue(0).ToString(), ///// without all junk above errors here /////
    //        MDWIdNumber = reader.GetValue(1).ToString(),
    //        MDWCompanyName = reader.GetValue(2).ToString()
    //    };

    CompanyList.Add(company);
}

Console.WriteLine(CompanyList.First().MDWCompanyName);

reader.Close();
command.Dispose();

Answer 1

这是问题所在：

public String MDWRowNumber { get => MDWRowNumber;

属性调用自身 - 因此堆栈溢出。

要么使用私有变量，

private string _MDWRowNumber;
public String MDWRowNumber { get => _MDWRowNumber; set => _MDWRowNumber = value; }

或自动属性

public String MDWRowNumber { get; set; }

Answer 2

在你的class中你有

public String MDWRowNumber { get => MDWRowNumber; set => MDWRowNumber = value; }

你不需要所有这些，它应该只是

public String MDWRowNumber { get; set; }

通过将其自身置于基础变量中，您已经混淆了它。

设置对象变量时出现 StackOverflow 异常

StackOverflow Exception when setting object variable

c#

stack-overflow

visual-studio-2017