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.NET Forum / Windows Forms / WinForm General / July 2006Displaying large amount of data in a Treeview
Hi, I would like to display a large amount of data stored in a file (100Mb or higher) in a treeview control. It would be very inefficient to preload all the data into the treeview since it would take an extremely long time to load the form and it would also consume a large amount of memory. My question is what would be an appropriate solution? I could use a memory map and then override the MouseClick to load only a batch of items each time the control is scrolled through, but it seems a rather awkward solution... Thanks in advance, Danny I dont think anyone can answer your question unless you are a 'little' more specific with what kind of data you are dealing with. Is it an XML document? This type of problem sounds like something that could be handled by formating your data into XML and parsing out only what you need. > Hi, > [quoted text clipped - 11 lines] > > Danny The type of data is irrelevant. I'm using a custom binary formatter to serialize to a file a collection of objects. Each object has a few fields that need to be displayed in the tree view in some type of hierarachy (I can go into details but I think it's irrelevant). My problem is not how to read the data or deserialize it, rather just displaying it. To be more precise, the data would eventually be just a string per each tree node. I know I can also use the solution of loading the data "on expand" but again, in some situations there would be too much data to even load the first level of the tree (that is only the root nodes without the sub nodes). > I dont think anyone can answer your question unless you are a 'little' > more specific with what kind of data you are dealing with. Is it an [quoted text clipped - 17 lines] > > > > Danny Can you perhaps load data based on what "level" or "depth" of the treeview you are on? > The type of data is irrelevant. I'm using a custom binary formatter to > serialize to a file a collection of objects. Each object has a few [quoted text clipped - 30 lines] > > > > > > Danny Take a look at Infralution's Virtual Tree. It does exactly what you want and will only load nodes in each level when they are actually required to support the displayed data. This enables it to handle display of huge data sources. Your can get more information and download a trial version from: www.infralution.com/virtualtree.html This functionality would be extremely difficult to build using the standard windows tree view and really requires a control written from scratch - which is a very large task. Regards Grant Frisken Infralution > The type of data is irrelevant. I'm using a custom binary formatter to > serialize to a file a collection of objects. Each object has a few [quoted text clipped - 8 lines] > first level of the tree (that is only the root nodes without the sub > nodes). Great control, exactly what I was looking for. I've already requested the control be purchase by my company, thank you! > Take a look at Infralution's Virtual Tree. It does exactly what you > want and will only load nodes in each level when they are actually [quoted text clipped - 25 lines] > > first level of the tree (that is only the root nodes without the sub > > nodes). Well, rather than "when the control is scrolled through", it would be "when a node is expanded". Also you would have to verifiy those childs nodes to see if they have childs. If so, you could add it a dummy node, and then when the parent node is expanded, do the same. It's something like MSDN library tree "Danny Liberty" <dliberty@gmail.com> escribió en el mensaje news:1151599981.745678.150130@p79g2000cwp.googlegroups.com... > Hi, > [quoted text clipped - 11 lines] > > Danny take a look at www.obout.com. I have not used his .net controls but I have used his TreeView control for ASP classic. It loads very fast, and if you want it to it will load a node only after you have clicked on it. It takes care of all the plumbing. Their support is good too. > Hi, > [quoted text clipped - 11 lines] > > Danny > take a look at www.obout.com. I have not used his .net controls but I have > used his TreeView control for ASP classic. It loads very fast, and if you [quoted text clipped - 18 lines] > > > > Danny
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