无法获取保存在数据库中的文本文件的内容(My

本文介绍了无法获取保存在数据库中的文本文件的内容(My-Sql)的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我编写了以下代码来插入文本文件并从My-Sql获取数据，但未获得所需的输出. 我按如下方式创建了表格 ID int AutoIncrement Fname varchar FData LongBlob 我的代码

I have written the following code to insert a text file and get data from My-Sql but I am not getting the required output. I created my table as follows ID int AutoIncrement Fname varchar FData LongBlob My code

string filePath = Server.MapPath("AchTemplates/genACH.txt"); string filename = Path.GetFileName(filePath); FileStream fs = new FileStream(filePath, FileMode.Open, FileAccess.Read); BinaryReader br = new BinaryReader(fs); Byte[] bytes = br.ReadBytes((Int32)fs.Length); br.Close(); fs.Close(); string strQuery = "insert into tblFiles(FName,FData) values (@_FName, @_FData)"; MySqlCommand cmd = new MySqlCommand(strQuery); cmd.Parameters.Add("@_FName", MySqlDbType.VarChar).Value = filename; cmd.Parameters.Add("@_FData", MySqlDbType.LongBlob).Value = bytes; InsertUpdateData(cmd); // To get the data i used the following code private void download(DataTable dt) { Byte[] bytes = (Byte[])dt.Rows[0]["FData"]; //byte[] bytes = Encoding.UTF8.GetBytes(Convert.ToChar(dt.Rows[0]["FData"])); Response.Buffer = true; Response.Charset = ""; Response.Cache.SetCacheability(HttpCacheability.NoCache); //Response.ContentType = dt.Rows[0]["ContentType"].ToString(); Response.AddHeader("content-disposition", "attachment;filename=" + dt.Rows[0]["FName"].ToString()); Response.BinaryWrite(bytes); Response.Flush(); Response.End(); }

So can any one tell what''s wrong going?

推荐答案

Response.BinaryWrite仅用于写入非字符串信息，因此我宁愿先将byte[]转换为字符串，然后将其写入Response. Hi, Response.BinaryWrite is used merely for writing non-string information, so I''d rather convert the byte[] to a string first, and then write it to the Response. string s = Encoding.UTF8.GetString((Byte[])dt.Rows[0]["FData"]); Response.Write(s);

问候

当您获得类似System.string[]的输出时，这表明您要求输入单元格/字段的Type，这是因为dt.Rows[0]["FName"]返回的是object，默认情况下，在调用ToString()时返回其类型. 要获取内容，请尝试转换为字符串: When you get output like System.string[] this indicates that you have asked for the Type of the cell/Field, this is because dt.Rows[0]["FName"] returns an object which, by default, returns it''s Type when ToString() is called on it. To get the content try casting to a string: Response.AddHeader("content-disposition", "attachment;filename=" + (string)dt.Rows[0]["FName"]);