錯誤：非靜態字段，方法或屬性需要對象引用

Question

當我想在「return（byte）SaleMode」行中使用「SetSaleMode」時，我有一個包含這些字段和這些靜態方法的類。發佈;」發生此錯誤，任何人都可以幫助我嗎？

這些都是我的代碼：

public enum SaleMode:byte { ToPost = 0, Downloadable = 1, DownloadableAndFreeTrial = 2, SourceSiteSale = 3 }; 
public enum FilePriceMode { ProductFile = 0, Free = 1, FreeTrial = 2 };
 

public class ProductDAL : BaseDAL 
{
 

#region fields 
public Int64 ID { get; set; } 
public string Name { get; set; } 
public Int64 Price { get; set; } 
public bool Private { get; set; } 
public Int64 ProductType { get; set; } 
public string Notes { get; set; } 
public string Image { get; set; } 
public DateTime Date { get; set; } 
public Int64 Owner { get; set; } 
public long Counter { get; set; } 
public bool Proved { get; set; } 
public byte[] Files { get; set; } 
public byte SaleMode { get; set; } 
public string SourceSiteSaleAddress { get; set; } 
public List<FilesOfProductsDAL> FOfPro; 

#endregion fields   

#region constructor 
public ProductDAL() 
{ 
    ID = -1; 
    FOfPro = new List<FilesOfProductsDAL>(); 
} 

public ProductDAL(string saveIconPath) 
{ 
    ID = -1; 
    this.Image = saveIconPath; 
    FOfPro = new List<FilesOfProductsDAL>(); 
} 
#endregion constructor 

#region method 

public static long InsertProduct(ProductDAL objProductDAL) 
{ 
    try 
    { 
     Int64 ID; 
     objProductDAL.SaleMode = SetSaleMode(objProductDAL); 
     SqlCommand Sqlcomm = new SqlCommand(); 
     Sqlcomm.CommandText = StoreQueries.InsertProduct; 
     Sqlcomm.CommandType = CommandType.StoredProcedure; 
     Sqlcomm.Parameters.AddWithValue("@Name", SqlDbType.NVarChar).Value = objProductDAL.Name; 
     Sqlcomm.Parameters.AddWithValue("@Price", SqlDbType.BigInt).Value = objProductDAL.Price; 
     Sqlcomm.Parameters.AddWithValue("@Private", SqlDbType.Bit).Value = objProductDAL.Private; 
     Sqlcomm.Parameters.AddWithValue("@ProductType", SqlDbType.BigInt).Value = objProductDAL.ProductType; 
     Sqlcomm.Parameters.AddWithValue("@Notes", SqlDbType.NVarChar).Value = objProductDAL.Notes; 
     Sqlcomm.Parameters.AddWithValue("@Date", SqlDbType.DateTime).Value = objProductDAL.Date; 
     Sqlcomm.Parameters.AddWithValue("@Image", SqlDbType.NVarChar).Value = objProductDAL.Image; 
     Sqlcomm.Parameters.AddWithValue("@Owner", SqlDbType.BigInt).Value = 1019;//objProductDL.Owner ; 
     Sqlcomm.Parameters.AddWithValue("@SaleMode", SqlDbType.VarBinary).Value = objProductDAL.SaleMode; 
     if (objProductDAL.Files == null) 
      Sqlcomm.Parameters.AddWithValue("@Files", SqlDbType.VarBinary).Value =System.Data.SqlTypes.SqlBinary.Null;// DBNull.Value; 
     else 
      Sqlcomm.Parameters.AddWithValue("@Files", SqlDbType.VarBinary).Value = objProductDAL.Files; 
     if (objProductDAL.SourceSiteSaleAddress == null) 
      Sqlcomm.Parameters.AddWithValue("@SourceSiteSaleAddress", SqlDbType.NVarChar).Value = DBNull.Value; 
     else 
      Sqlcomm.Parameters.AddWithValue("@SourceSiteSaleAddress", SqlDbType.NVarChar).Value = objProductDAL.SourceSiteSaleAddress; 
     Sqlcomm.Parameters.AddWithValue("@CheangedSet", SqlDbType.NVarChar).Value = "محصول جدید است."; 
     Sqlcomm.Parameters.AddWithValue("PID", SqlDbType.BigInt).Value =objProductDAL.ID; 

     ID = Convert.ToInt64(ExecuteScalar(Sqlcomm)); 

     objProductDAL.Image = objProductDAL.Image.Replace(Path.GetFileNameWithoutExtension(objProductDAL.Image), ID.ToString()); 

     for (int i = 0; i <objProductDAL.FOfPro.Count; i++) 
     { objProductDAL.FOfPro[i].FileUrl = objProductDAL.FOfPro[i].FileUrl.Replace(Path.GetFileNameWithoutExtension(objProductDAL.FOfPro[i].FileUrl), Path.GetFileNameWithoutExtension(objProductDAL.FOfPro[i].FileUrl) + "." + ID.ToString() + "." + i.ToString()); } 
     UpdateFileAndImageUrl(Store.SerializeData(objProductDAL.FOfPro), objProductDAL.Image, ID); 
     return ID; 
    } 
    catch (Exception) { throw; } 
} 
private static byte SetSaleMode(ProductDAL objProductDAL) 
{ 
    if (objProductDAL.SourceSiteSaleAddress == null || objProductDAL.SourceSiteSaleAddress == "") 
    { 
     if (!ProductTypesDAL.IsDownloadable(objProductDAL.ProductType)) 
      return (byte)SaleMode.ToPost; 
     if (objProductDAL.FOfPro.Exists(priceMode => priceMode.FilePriceMode == (int)FilePriceMode.FreeTrial)) 
      return (byte)SaleMode.DownloadableAndFreeTrial; 
     else 
      return (byte)SaleMode.Downloadable; 
    } 
    else 
     return (byte)SaleMode.SourceSiteSale; 
} 

}

Answer 1

您有一個名爲SaleMode性質就像枚舉SaleMode。

當您在課堂中使用SaleMode時，您指的是屬性，而不是枚舉。該屬性在整個範圍內隱藏枚舉。

我建議您重命名屬性，以便它不與枚舉衝突。