vb.net

问题 How can I export an Excel spreadsheet to PDF/ A (ISO 19005-1)? EDIT: I'm asking for PDF/A, and not plain old PDF 1.5 as it exports by default. I've even emphasized the A in my original question. I can already export Word and PowerPoint documents to PDF/A, using the ExportAsFixedFormat() function, since the Word and PowerPoint functions both have an optional UseISO19005_1 parameter, but the Excel version is very different, and is missing lots of parameters. I can't seem to find any way to

问题 How can I export an Excel spreadsheet to PDF/ A (ISO 19005-1)? EDIT: I'm asking for PDF/A, and not plain old PDF 1.5 as it exports by default. I've even emphasized the A in my original question. I can already export Word and PowerPoint documents to PDF/A, using the ExportAsFixedFormat() function, since the Word and PowerPoint functions both have an optional UseISO19005_1 parameter, but the Excel version is very different, and is missing lots of parameters. I can't seem to find any way to

问题 I need to upload a file to SFTP server. I am using VB.NET 2008. How can I upload a simple .csv file from my local computer to SFTP server using port number, user name and password, etc? Thanks in advance. 回答1: A commonly used open source SFTP library for .NET is SSH.NET. With it, you can use a code like this: Dim client As SftpClient = New SftpClient("example.com", "username", "password") client.Connect() Using stream As Stream = File.OpenRead("C:\local\path\some.csv") client.UploadFile

问题 I need to upload a file to SFTP server. I am using VB.NET 2008. How can I upload a simple .csv file from my local computer to SFTP server using port number, user name and password, etc? Thanks in advance. 回答1: A commonly used open source SFTP library for .NET is SSH.NET. With it, you can use a code like this: Dim client As SftpClient = New SftpClient("example.com", "username", "password") client.Connect() Using stream As Stream = File.OpenRead("C:\local\path\some.csv") client.UploadFile

问题 I would like to know how do I change the border color and border width of textbox as something shown below If it is mouse hover I need to display one colour and on mouse down I need to display another colour. Can anyone explain me the detailed process with the source if available. 回答1: You could do the following: Place the TextBox inside a Panel Give the panel 1 pixel padding Set the text dock to Fill Make the text box to have no border Then, handle mouse events on the text box, switch the

问题 I would like to know how do I change the border color and border width of textbox as something shown below If it is mouse hover I need to display one colour and on mouse down I need to display another colour. Can anyone explain me the detailed process with the source if available. 回答1: You could do the following: Place the TextBox inside a Panel Give the panel 1 pixel padding Set the text dock to Fill Make the text box to have no border Then, handle mouse events on the text box, switch the

问题 I know several Point structs in .NET: System.Drawing.Point , System.Windows.Point , Sys.UI.Point , but all of them are in high-level UI libraries (GDI+, WPF, AJAX). I need a Point struct for calculations in my class library which I don't want to tie to any specific UI technology. Is there any UI-independent Point struct in .NET? Or I will need to create it myself? That is simple, I know, but sounds like reinventing the wheel. 回答1: Reinvent the wheel. It will run smoother! Really, if it's just

问题 I need to set a minimum length for a password that can be used in a textbox and then set a label which will say if it meets the minimum number of characters required. I know how to set the limit of characters, what I can't do is the part where it will show in a label as soon as I leave the textbox. I was thinking I need to use an event, like maybe Leave or LostFocus, but it's not working. Please help :( 回答1: Ok, There are plenty of ways to do what you want to achieve. I personally like to a

问题 I need to set a minimum length for a password that can be used in a textbox and then set a label which will say if it meets the minimum number of characters required. I know how to set the limit of characters, what I can't do is the part where it will show in a label as soon as I leave the textbox. I was thinking I need to use an event, like maybe Leave or LostFocus, but it's not working. Please help :( 回答1: Ok, There are plenty of ways to do what you want to achieve. I personally like to a

问题 I need to stop the "ding" sound while pressing enter but I use it to send a message. There is my code: Private Sub textbox2_KeyDown(sender As Object, e As System.Windows.Forms.KeyEventArgs) _ Handles TextBox2.KeyDown If e.KeyCode = Keys.Enter Then TextBox3.ReadOnly = True If TextBox2.Text = ("") Then Else Dim PostData = "token=" & TextBox1.Text & "&msg=" & TextBox3.Text & ": " & TextBox2.Text Dim request As WebRequest = WebRequest.Create("http://url.com/msg.php") request.Method = "POST" Dim