话不多说,直接上代码
<input id="InputFile" style=" 399px" type="file" runat="server" /> <asp:Button ID="Button1" runat="server" Text="保存" onclick="Button1_Click" /> <asp:label ID="Label1" runat="server" text="Label"></asp:label> <asp:Image ID="Image1" runat="server" />
protected void Button1_Click(object sender, EventArgs e) { string fileName = InputFile.PostedFile.FileName; Boolean fileOK = false; if (!string.IsNullOrWhiteSpace(fileName)) { //判断上传文件的扩展名是否为允许的扩展名".gif", ".png", ".jpeg", ".jpg" ,".bmp" String fileExtension = System.IO.Path.GetExtension(fileName).ToLower(); String[] Extensions = { ".gif", ".png", ".jpeg", ".jpg", ".bmp" }; for (int i = 0; i < Extensions.Length; i++) { if (fileExtension == Extensions[i]) { fileOK = true; } } } //如果上传文件扩展名为允许的扩展名,则将文件保存在服务器上指定的目录中 if (fileOK) { try { HttpPostedFile upFile = InputFile.PostedFile;//HttpPostedFile对象,用来读取上传图片的属性 int fileLength = upFile.ContentLength;//记录文件的长度 byte[] fileBytePicture = new byte[fileLength];//用图片的长度来初始化一个字节数组存储临时的图片文件 Stream fileStream = upFile.InputStream;//建立文件流对象 fileStream.Read(fileBytePicture, 0, fileLength); string filetext = Convert.ToBase64String(fileBytePicture); Label1.Text = filetext; } catch (Exception ex) { MessageBox("文件不能上传,原因:" + ex.Message); } } else { MessageBox("不能上传这种类型的文件"); } } protected void MessageBox(string str) { Page.ClientScript.RegisterStartupScript(Page.GetType(), "message", "<script language='javascript' defer>alert('" + str + "');</script>"); }