本文介绍了全局/类变量值在同一类中的按钮单击事件内被跳过的处理方法,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 Hello Everyone, 我遇到了这个问题, 这是我使用母版页概念的简单应用程序并创建了一个简单的页面。其中包含AsyncFileUpload控件和提交按钮 代码页: 部分 类 Pages_ArtWork_UploadImages 继承 BasePage 公共 imgFilePath 作为 字符串 = 没有 ..... 受保护的 Sub imgFileUpload_UploadedComplete( ByVal sender 正如 对象, ByVal e As AjaxControlToolkit.AsyncFileUploadEventArgs) System.Threading.Thread.Sleep( 1500 ) 如果 imgFileUpload.HasFile 那么 如果 checkFileType(System.IO。 Path.GetExtension(e.filename))然后 ' 获取所选图像的流并将其分配给图像对象。 Dim UploadedImage As System.Drawing.Image = System.Drawing.Image.FromStream(imgFileUpload.PostedFile.InputStream) ' 检查宽度或高度是否大于250px 如果 UploadedImage.PhysicalDimension.Width> 250 OrElse UploadedImage.PhysicalDimension.Height> 250 然后 Dim 提醒作为 字符串 =( alert('图像大小应该精确为250 * 250维。当前图像宽度为 + UploadedImage.PhysicalDimension.Width.ToString + 和height为 + UploadedImage.PhysicalDimension.Height.ToString + 。');) ScriptManager.RegisterStartupScript( Me ,[ GetType ](), JScript,alert, True ) 否则 ' 将文件保存在应用程序中。 imgFilePath = Server.MapPath( ../../ Uploads / Images /)+(ddl_EditHw.SelectedValue& System.IO.Path.GetExtension(e.filename)) imgFileUpload.SaveAs(imgFilePath) lblResult.Visible = False ScriptManager.RegisterClientScriptBlock( Me , Me 。 GetType (), 脚本, alert('File Uploadedfully');, True ) 结束 如果 其他 ScriptManager .RegisterClientScriptBlock( Me , Me 。 GetType (), 脚本, alert('上传失败 - 检查文件类型(.jpg,.png,.gif,.jpeg)'); , True ) 结束 如果 结束 如果 ClearContents(sender) 结束 Sub 公共 Sub btnSubmit_Click( ByVal sender 作为 对象, ByVal e As System.EventArgs)句柄 btnSubmit.Click 如果 不 imgFilePath = Nothing 然后 .... ... 其他 lblResult.Text = 请先上传图片。 lblResult.Visible = True 结束 如果 在上面的提交点击事件中,当我尝试从imgFilePath变量获取图像文件路径时。它返回Nothing。如果我在其他函数中使用相同的变量它完美地工作。但不知道Click事件有什么问题。 等待您的回复。 感谢你 问候: Rohit更多解决方案 您好Rohit More, 为此目的使用隐藏字段 隐藏字段中的设置值以及需要时获取。 Hello Everyone,I am getting stuck inside this problem, Here is my simple application using Master Page Concept and created one simple Page. which contains AsyncFileUpload Control and Submit ButtonCode Page :Partial Class Pages_ArtWork_UploadImages Inherits BasePage Public imgFilePath As String = Nothing.....Protected Sub imgFileUpload_UploadedComplete(ByVal sender As Object, ByVal e As AjaxControlToolkit.AsyncFileUploadEventArgs) System.Threading.Thread.Sleep(1500) If imgFileUpload.HasFile Then If checkFileType(System.IO.Path.GetExtension(e.filename)) Then ' Getting the stream of the selected image and assign it to the Image Object. Dim UploadedImage As System.Drawing.Image = System.Drawing.Image.FromStream(imgFileUpload.PostedFile.InputStream) ' Checking if the Width or height is greater than 250px If UploadedImage.PhysicalDimension.Width > 250 OrElse UploadedImage.PhysicalDimension.Height > 250 Then Dim alert As String = ("alert('Image size should be exactly 250*250 dimension. Your Current Image width is " + UploadedImage.PhysicalDimension.Width.ToString + " and height is " + UploadedImage.PhysicalDimension.Height.ToString + ".');") ScriptManager.RegisterStartupScript(Me, [GetType](), "JScript", alert, True) Else 'Save File in Application. imgFilePath = Server.MapPath("../../Uploads/Images/") + (ddl_EditHw.SelectedValue & System.IO.Path.GetExtension(e.filename)) imgFileUpload.SaveAs(imgFilePath) lblResult.Visible = False ScriptManager.RegisterClientScriptBlock(Me, Me.GetType(), "Script", "alert('File Uploaded Successfully');", True) End If Else ScriptManager.RegisterClientScriptBlock(Me, Me.GetType(), "Script", "alert('Uploading Failed - Check File Type (.jpg, .png, .gif, .jpeg)');", True) End If End If ClearContents(sender) End SubPublic Sub btnSubmit_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnSubmit.Click If Not imgFilePath = Nothing Then....... Else lblResult.Text = "Please Upload Image first." lblResult.Visible = True End IfIn above submit click event , when I try to get Image File path from imgFilePath variable. It returns "Nothing". If I use same variable inside other functions It works perfectly. but dont know what is problem with Click event.Waiting for your kind reply.Thanking YouRegards :Rohit More 解决方案 Hi Rohit More,use hidden field for this purpose set value in hidden field and the get when required. 这篇关于全局/类变量值在同一类中的按钮单击事件内被跳过的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持! 11-03 05:01