c# - 添加列表项并获取 NullReferenceException C#

Question

我有以下模型：

public static class AttachmentsList {
    public static List<AttachmentDetails> AttachmentPath { get; set; }
}

public class AttachmentDetails {
    public string AttachmentPath { get; set; }
    public string AttachmentName { get; set; }
    public MediaFile MediaFileObject { get; set; }
}

我想添加项目，但在使用以下代码时AttachmentPath我得到了：object reference not set to an instance of an object

AttachmentDetails attachmentDetails = new AttachmentDetails();

attachmentDetails.AttachmentName = attachmentsViewModel.GetFileName(mediaFile.Path);
attachmentDetails.AttachmentPath = mediaFile.Path;
attachmentDetails.MediaFileObject = mediaFile;

AttachmentsList.AttachmentPath.Add(attachmentDetails);

标签： c#xamarin.forms