优化大文件二次读取被占用问题。

CnasSynchronusClient/RemoteFileCopy.cs

@@ -163,9 +163,12 @@ namespace CnasSynchronusClient
             AppLog.Error("CopyFileFromRemote dst 打印日志 " + dst);
             AppLog.Error("CopyFileFromRemote fileName 打印日志 " + fileName);
 
+            FileStream inFileStream  = null;
+            FileStream outFileStream = null;
+
             try
             {
-                FileStream inFileStream = new FileStream(src, FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
+                inFileStream = new FileStream(src, FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
                 if (!Directory.Exists(dst))
                 {
                     Directory.CreateDirectory(dst);
@@ -173,23 +176,36 @@ namespace CnasSynchronusClient
                 dst = Path.Combine(dst, fileName);
                 AppLog.Error("CopyFileFromRemote dst 打印日志 " + dst);
 
-                FileStream outFileStream = new FileStream(dst, FileMode.OpenOrCreate);
-                byte[] buf = new byte[inFileStream.Length];
+                if (true == File.Exists(dst))
+                {
+                    try
+                    {
+                        File.SetAttributes(dst, FileAttributes.Normal);
+                        File.Delete(dst);
+                    }
+                    catch { }
+                }
+
+                outFileStream = new FileStream(dst, FileMode.Create);
+                byte[] buf = new byte[1024];
                 int byteCount;
                 while ((byteCount = inFileStream.Read(buf, 0, buf.Length)) > 0)
                 {
                     outFileStream.Write(buf, 0, byteCount);
                 }
-                inFileStream.Flush();
-                inFileStream.Close();
-                outFileStream.Flush();
-                outFileStream.Close();
+                outFileStream?.Flush();
             }
             catch (Exception ex)
             {
                 AppLog.Error(ex.Message);
             }
+            finally
+            {
+                inFileStream?.Close();
+                inFileStream?.Dispose();
+                outFileStream?.Close();
+                outFileStream?.Dispose();
+            }
         }
-        
     }
 }