我试图将两个PDF文件读入两个内存流,然后返回一个包含两个流数据的流.但我似乎不明白我的代码有什么问题.
示例代码:
string file1Path = "Sampl1.pdf";
string file2Path = "Sample2.pdf";
MemoryStream stream1 = new MemoryStream(File.ReadAllBytes(file1Path));
MemoryStream stream2 = new MemoryStream(File.ReadAllBytes(file2Path));
stream1.Position = 0;
stream1.Copyto(stream2);
return stream2; /*supposed to be containing data of both stream1 and stream2 but contains data of stream1 only*/
我将EF与DB first方法一起使用。更新EDMX文件时遇到问题。假设我有一个表InvoiceT和另一个表LookupT。现在，在InvoiceT中，我有一列InvoiceType与LookupT具有FK关系。现在，实体在InvoiceT类中创建了名为LookupT的导航属性。到目前为止，它很好。
现在，我添加了名为InvoiceStatus的另一列和带有LookupT的FK。现在，实体创建了另一个名为LookupT1的导航属性。但是这里的问题是，第一个导航属性LookupT没有指向其原始数据，即InvoiceType。相反，它现在指向InvoiceStatus数据。有人可以向我解释为什么它会这样，我该怎么办？
public class InvoiceT
{
public int InvoiceId {get;set;}
public int InvoiceStatusLkpId {get;set;}
public int InvoiceTypeLkpId {get;set;}
public virtual LookupT LookupT {get;set;} // Previously pointing to Type. Now to Status.
public virtual LookupT LookupT1 {get;set;} // Pointing to Type
}
public class LookupT
{
public int LookupId {get;set;}
public string LookupValue {get;set}
public virtual ICollection<InvoiceT> InvoiceT {get;set;}
public virtual ICollection<InvoiceT> InvoiceT1 {get;set;}
}