用戶從數據庫下載後需要幫助來更改文件格式

Question

我錯過了這段代碼中的內容嗎？因爲我測試它時我得到的文件類型爲「文件」而不是PDF。

protected void Button1_Click(object sender, EventArgs e) 
{ 
    SqlConnection conn = new SqlConnection(ConfigurationManager.ConnectionStrings["DatabaseConnectionString1"].ConnectionString); 
    conn.Open(); 
    string pdffile = "select pdf from users where ID='" + TextBoxLic.Text + "'"; 
    SqlCommand pdfcom = new SqlCommand(pdffile, conn); 
    SqlDataReader reader = pdfcom.ExecuteReader(); 
    if (reader.Read()) 
    { 
     Byte[] pdfData = (byte[])reader.GetValue(0); 
     Response.ContentType = "Application/pdf";    
     Response.AppendHeader("content-disposition", "attachment; filename=" + TextBoxLic.Text); 
     Response.BinaryWrite(pdfData); 
     Response.End(); 
     conn.Close(); 
    } 
} 

https://i.gyazo.com/8eb75d4e55bed17155690531841d80c7.png

Answer 1

也許嘗試加入

Response.Flush(); Response.Close();

後Response.BinaryWrite(pdfData);

更重要的是它應該是 while (reader.Read()) 而非 if (reader.Read())

我建議你在這裏讀了起來：https://msdn.microsoft.com/en-us/library/system.data.sqlclient.sqldatareader.read(v=vs.110).aspx

Answer 2

您需要的Content-Type頭設置爲application/pdf。