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.NET Forum / Windows Forms / WinForm General / February 2007MDI app - don't load document twice
How can I (in VB.Net 2005) check (when loading a file), to make sure if it's already been loaded - then prompt the user to see if they really want to do it (since it's already been loaded)? How do you know if it has already been loaded? Robin S. ----------------------------- > How can I (in VB.Net 2005) check (when loading a file), to make sure if > it's already been loaded - then prompt the user to see if they really > want to do it (since it's already been loaded)? > How can I (in VB.Net 2005) check (when loading a file), to make sure if it's > already been loaded - then prompt the user to see if they really want to do > it (since it's already been loaded)? what kind of file is that? or are you referring to an MDI child form? The standard response is not to nform the user but just to bring the already open file to the front or show it if it's hidden.  SignatureBob Powell [MVP] Visual C#, System.Drawing Ramuseco Limited .NET consulting http://www.ramuseco.com Find great Windows Forms articles in Windows Forms Tips and Tricks http://www.bobpowell.net/tipstricks.htm Answer those GDI+ questions with the GDI+ FAQ http://www.bobpowell.net/faqmain.htm All new articles provide code in C# and VB.NET. Subscribe to the RSS feeds provided and never miss a new article. > How can I (in VB.Net 2005) check (when loading a file), to make sure if > it's already been loaded - then prompt the user to see if they really want > to do it (since it's already been loaded)? OK - I understand that - but how do you do it ?? In vb6, you would iterate through the forms collection (For Each objForm In Forms) That's the first line - it got an error but didn't show me any of the possible ways to change it... > The standard response is not to nform the user but just to bring the > already open file to the front or show it if it's hidden. > >> How can I (in VB.Net 2005) check (when loading a file), to make sure if >> it's already been loaded - then prompt the user to see if they really >> want to do it (since it's already been loaded)? add this method in your MDI form class private void ShowForm(Type formType) { foreach (Form child in this.MdiChildren) { //if (formType.Name == child.Name) if (formType.IsInstanceOfType(child)) { child.Focus(); return; } } Form frm = (Form)Activator.CreateInstance(formType); frm.MdiParent = this; frm.Show(); } you can show your child form using ShowForm(typeof(YourChildFormClass)) > OK - I understand that - but how do you do it ?? > [quoted text clipped - 10 lines] > >> it's already been loaded - then prompt the user to see if they really > >> want to do it (since it's already been loaded)? The simplest way is to rely on the naming scheme of the documents. For example when loadin a file the document will be called by the filename or possibly just it's file name without the extension. When a file load attempt is made, check all your existing loaded documents to see if one of the same name exists, if it does, show it, if it doesn't continue with the load. SignatureBob Powell [MVP] Visual C#, System.Drawing Ramuseco Limited .NET consulting http://www.ramuseco.com Find great Windows Forms articles in Windows Forms Tips and Tricks http://www.bobpowell.net/tipstricks.htm Answer those GDI+ questions with the GDI+ FAQ http://www.bobpowell.net/faqmain.htm All new articles provide code in C# and VB.NET. Subscribe to the RSS feeds provided and never miss a new article. > OK - I understand that - but how do you do it ?? > [quoted text clipped - 10 lines] >>> it's already been loaded - then prompt the user to see if they really >>> want to do it (since it's already been loaded)? I've got a Property in my MDI form (DocName), which returns the ActiveMDI file's document name (file loaded and showing in rtb). I'm still stumbling around a bit I'm using VB.Net (I couldn't translate from C# example given): I've got : the variable: 'filename' is the file I'm trying to load Dim child as System.Windows.Forms.Form ' <-- don't know how to refer to the DocName of each For each Child in Me.MdiChildren If CurrentForm.DocName = fileName Then ' <-- what do I need here, to compare files? blLoaded = True Exit For Else blLoaded = False End If next Can anyone help me finish here? > The simplest way is to rely on the naming scheme of the documents. For > example when loadin a file the document will be called by the filename or [quoted text clipped - 18 lines] >>>> it's already been loaded - then prompt the user to see if they really >>>> want to do it (since it's already been loaded)? Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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