本文为大家分享了fileupload控件实现上传图片后并进行预览图片的功能,并对web.config进行了配置,先看一下最终效果:
页面代码:
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< form id = "form1" runat = "server" > < div > < asp:FileUpload ID = "FileUpload1" runat = "server" /> < asp:Button ID = "Button1" runat = "server" Text = "上传" Width = "54px" OnClick = "Button1_Click" /> < asp:Label ID = "Label1" runat = "server" Text = "" Style = "color: Red" ></ asp:Label > < asp:Image runat = "server" ID = "Image1" Style="z-index: 102; left: 20px; position: absolute; top: 49px" Width = "73px" /> </ div > </ form > |
后台代码:
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using System; using System.Data; using System.Configuration; using System.Web; using System.Web.Security; using System.Web.UI; using System.Web.UI.WebControls; using System.Web.UI.WebControls.WebParts; using System.Web.UI.HtmlControls; namespace Web.File { public partial class WebForm1 : System.Web.UI.Page { protected void Page_Load( object sender, EventArgs e) { } #region 文件上传 /// <summary> /// 文件上传 /// </summary> protected void Button1_Click( object sender, EventArgs e) { if (FileUpload1.FileName == "" ) { this .Label1.Text = "上传文件不能为空" ; return ; } bool fileIsValid = false ; //如果确认了上传文件,则判断文件类型是否符合要求 if ( this .FileUpload1.HasFile) { //获取上传文件的后缀 String fileExtension = System.IO.Path.GetExtension( this .FileUpload1.FileName).ToLower(); String[] restrictExtension = { ".gif" , ".jpg" , ".bmp" , ".png" }; //判断文件类型是否符合要求 for ( int i = 0; i < restrictExtension.Length; i++) { if (fileExtension == restrictExtension[i]) { fileIsValid = true ; } //如果文件类型符合要求,调用SaveAs方法实现上传,并显示相关信息 if (fileIsValid == true ) { //上传文件是否大于10M if (FileUpload1.PostedFile.ContentLength > (10 * 1024 * 1024)) { this .Label1.Text = "上传文件过大" ; return ; } try { this .Image1.ImageUrl = "~/File/" + FileUpload1.FileName; this .FileUpload1.SaveAs(Server.MapPath( "~/File/" ) + FileUpload1.FileName); this .Label1.Text = "文件上传成功!" ; } catch { this .Label1.Text = "文件上传失败!" ; } finally { } } else { this .Label1.Text = "只能够上传后缀为.gif,.jpg,.bmp,.png的文件" ; } } } } #endregion } } |
Web.config 配置:
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<!--因为FileUpload 控件上传最大为4M,如果要上传更大文件,改下maxRequestLength的大小--> < configuration > < system.web > < compilation debug = "true" targetFramework = "4.0" /> < httpRuntime requestValidationMode = "2.0" maxRequestLength = "10485760" executionTimeout = "3600" appRequestQueueLimit = "10000" /> </ system.web > </ configuration > |
亲,你可以在自己的项目中实现fileupload控件上传图片并进行预览图片的功能,这样网站更具有实用性,基本步骤就是这些,可能还有小编遗漏的地方,希望大家谅解。