字段初始值设定项不能引用非静态字段，方法或属性

Question

以下是我的代码：

private BitsManager manager;
private const string DisplayName = "Test Job";       

public SyncHelper()
{
    manager = new BitsManager();
}        

BitsJob uploadBitsJob = manager.CreateJob(DisplayName, JobType.Upload);

我收到以下错误：

A field initializer cannot reference the non-static field, method, or property 'BITSIntegrationModule.SyncService.SyncHelper.manager'

Answer 1

该行

BitsJob uploadBitsJob = manager.CreateJob(DisplayName, JobType.Upload);

无法访问管理器，因为它尚未设置为任何内容 - 您可以将分配移动到构造函数中 -

private readonly BitsManager manager;
private const string DisplayName = "Test Job";       
BitsJob readonly uploadBitsJob;

public SyncHelper()
{
  manager = new BitsManager();
  uploadBitsJob = manager.CreateJob(DisplayName, JobType.Upload);
}   

Answer 2

uploadBitsJob在类级别声明，使其成为一个字段。字段实例不能用于初始化其他字段。

相反，您可以在不初始化的情况下声明该字段：

BitsJob uploadBitsJob;

然后在构造函数中初始化字段：

public SyncHelper()
{
  manager = new BitsManager();
  uploadBitsJob = manager.CreateJob(DisplayName, JobType.Upload);//here.  Now manager is initialized
}  

Answer 3

尝试从静态方法访问非静态属性时通常会发生这种情况。请提供更多代码。