ASP.NET下如何上傳圖片到資料庫，並且讀出圖片
答1：首先在SQL Server中建立一個圖片儲存的數庫表，ImageData Column為圖象二進位制資料儲存欄位，ImageContentType Column為圖象檔案型別記錄欄位，ImageDescription Column為儲蓄圖象檔案說明欄位,ImageSize Column為儲存圖象檔案長度欄位，結構如下： CREATE TABLE [dbo].[ImageStore] ( [ImageID] [int] IDENTITY (1, 1) NOT NULL , [ImageData] [image] NULL , [ImageContentType] [varchar] (50) COLLATE Chinese_PRC_CI_AS NULL , [ImageDescription] [varchar] (200) COLLATE Chinese_PRC_CI_AS NULL , [ImageSize] [int] NULL ) ON [PRIMARY] TEXTIMAGE_ON [PRIMARY] */ //UpLoadImage.aspx程式內容如下： <%@ Page Inherits="UploadImage.UploadImage" SRC="UpLoadImage.cs" Language="C#"%> <HTML><title>上傳圖片</title> <BODY bgcolor="#FFFFFF"> <FORM ENCTYPE="multipart/form-data" RUNAT="server" ID="Form1"> <TABLE RUNAT="server" WIDTH="700" ALIGN="left" ID="Table1" cellpadding="0" cellspacing="0" border="0"> <TR> <TD>上傳圖片(選擇你要上傳的圖片)</TD> <TD> <INPUT TYPE="file" ID="UP_FILE" RUNAT="server" STYLE="Width:320" ACCEPT="text/*" NAME="UP_FILE"> </TD> </TR> <TR> <TD> 檔案說明(新增上傳圖片說明，如：作者、出處) </TD> <TD> <asp:TextBox RUNAT="server" WIDTH="239" ID="txtDescription" MAINTAINSTATE="false" /> </TD> </TR> <TR> <TD> <asp:Label RUNAT="server" ID="txtMessage" FORECOLOR="red" MAINTAINSTATE="false" /> </TD> <TD> <asp:Button RUNAT="server" WIDTH="239" ONCLICK="Button_Submit" TEXT="Upload Image" /> </TD> </TR> </TABLE> </FORM> </BODY> </HTML> //------------------------------------------------------------------- //UpLoadImage.cs程式內容如下： using System; using System.Web; using System.IO; using System.Data; using System.Data.SqlClient; using System.Web.UI; using System.Web.UI.WebControls; using System.Web.UI.HtmlControls; namespace UploadImage { public class UploadImage : Page { protected HtmlInputFile UP_FILE; //HtmlControl、WebControls控制元件物件 protected TextBox txtDescription; protected Label txtMessage; protected Int32 FileLength = 0; //記錄檔案長度變數 protected void Button_Submit(System.Object sender, System.EventArgs e) { HttpPostedFile UpFile = UP_FILE.PostedFile; //HttpPostedFile物件，用於讀取圖象檔案屬性 FileLength = UpFile.ContentLength; //記錄檔案長度 try { if (FileLength == 0) { //檔案長度為零時 txtMessage.Text = "<b>請你選擇你要上傳的檔案</b>"; } else { Byte[] FileByteArray = new Byte[FileLength]; //圖象檔案臨時儲存Byte陣列 Stream StreamObject = UpFile.InputStream; //建立資料流對像 //讀取圖象檔案資料，FileByteArray為資料儲存體，0為資料指標位置、FileLnegth為資料長度 StreamObject.Read(FileByteArray,0,FileLength); //建立SQL Server連結 SqlConnection Con = new SqlConnection("Data Source=Localhost;Initial Catalog=testdb;User ID=sa;Pwd=;"); String SqlCmd = "INSERT INTO ImageStore (ImageData, ImageContentType, ImageDescription, ImageSize) VALUES (@Image, @ContentType, @ImageDescription, @ImageSize)"; SqlCommand CmdObj = new SqlCommand(SqlCmd, Con); CmdObj.Parameters.Add("@Image",SqlDbType.Binary, FileLength).Value = FileByteArray; CmdObj.Parameters.Add("@ContentType", SqlDbType.VarChar,50).Value = UpFile.ContentType; //記錄檔案型別 //把其它單表資料記錄上傳 CmdObj.Parameters.Add("@ImageDescription", SqlDbType.VarChar,200).Value = txtDescription.Text; //記錄檔案長度，讀取時使用 CmdObj.Parameters.Add("@ImageSize", SqlDbType.BigInt,8).Value = UpFile.ContentLength; Con.Open(); CmdObj.ExecuteNonQuery(); Con.Close(); txtMessage.Text = "<p><b>OK!你已經成功上傳你的圖片</b>";//提示上傳成功 } } catch (Exception ex) { txtMessage.Text = ex.Message.ToString(); }}}} //---------------------------------------------------------------------- //好了，圖片已經上傳到資料庫，現在還要幹什麼呢？當然是在資料庫中讀取及顯示在Web頁中啦,請看以下程式: //ReadImage.aspx程式內容如下： /----------------------------------------------------------------------- <%@ Page Inherits="ReadImage.MainDisplay" SRC="ReadImage.cs"%> //---------------------------------------------------------------------- //ReadImage.cs程式內容如下： using System; using System.Data; using System.Data.SqlClient; using System.Web.UI; using System.Web.UI.WebControls; using System.Web.UI.HtmlControls; namespace ReadImage { public class MainDisplay : System.Web.UI.Page { public void Page_Load(System.Object sender, System.EventArgs e) { int ImgID = Convert.ToInt32(Request.QueryString["ImgID"]); //ImgID為圖片ID //建立資料庫連結 SqlConnection Con = new SqlConnection("Data Source=KING;Initial Catalog=testdb;User ID=sa;Pwd=;"); String SqlCmd = "SELECT * FROM ImageStore WHERE ImageID = @ImageID"; SqlCommand CmdObj = new SqlCommand(SqlCmd, Con); CmdObj.Parameters.Add("@ImageID", SqlDbType.Int).Value = ImgID; Con.Open(); SqlDataReader SqlReader = CmdObj.ExecuteReader(); SqlReader.Read(); Response.ContentType = (string)SqlReader["ImageContentType"];//設定輸出檔案型別 //輸出圖象檔案二進位制數制 Response.OutputStream.Write((byte[])SqlReader["ImageData"], 0, (int)SqlReader["ImageSize"]); Response.End(); Con.Close(); //很簡單吧^_^ } } } //-------------------------------------------------------------------- //最後，我們當然要把它在Web頁面顯示出來啦 //ShowImage.hml <html> <body> 這個是從資料庫讀取出來的圖象：<img src="ReadImage.aspx?ImgID=1"> <body> </html> //------------------------------------------------------------------ //最後，這程式當然還很多改進之處，希望大家多想想多編編一定可以寫出更多的圖象上傳程式 //Good Luck，engine ______________________________________________________________________________________________ 答2： up ______________________________________________________________________________________________ 答3：把影象檔案上傳到資料庫，並從資料庫讀出 採用引數 上傳圖片到資料庫: using System; using System.Collections; using System.ComponentModel; using System.Data; using System.Data.SqlClient; using System.Drawing; using System.Web; using System.Web.SessionState; using System.Web.UI; using System.Web.UI.WebControls; using System.Web.UI.HtmlControls; using System.IO; namespace myUpLoad { /// <summary> /// img2sql 的摘要說明。 /// </summary> public class img2sql : System.Web.UI.Page { protected System.Web.UI.WebControls.TextBox imgTitleTextBox; protected System.Web.UI.HtmlControls.HtmlInputFile upLoadImg; protected System.Web.UI.WebControls.RequiredFieldValidator RequiredFieldValidator1; protected System.Web.UI.WebControls.Button Button1; protected SqlConnection myConnection; private void Page_Load(object sender, System.EventArgs e) { // 在此處放置使用者程式碼以初始化頁面 string conn="server=(local);database=test;uid=sa;pwd=ilovenm"; myConnection=new SqlConnection(conn); } #region Web Form Designer generated code override protected void OnInit(EventArgs e) { // // CODEGEN：該呼叫是 ASP.NET Web 窗體設計器所必需的。 // InitializeComponent(); base.OnInit(e); } /// <summary> /// 設計器支援所需的方法 - 不要使用程式碼編輯器修改 /// 此方法的內容。 /// </summary> private void InitializeComponent() { this.Button1.Click += new System.EventHandler(this.Button1_Click); this.Load += new System.EventHandler(this.Page_Load); } #endregion private void Button1_Click(object sender, System.Eve