Parsing font info and converting it to System.Draw

问题:

i have a text file that contains font information like this:

Arial, 12.5

...and I need to read that info into label.Font like this:

label.Font = new Font(fontNameFields[0], Single.Parse(fontNameFields[1]));

... but I always get the following error:

Index was outside the bounds of the Array.

Can somebody please help me with this?

Thanks jason.

Code I have:

    MatchCollection lines = Regex.Matches(File.ReadAllText(Path), @"(.+?)\r\n""([^""]+)""\r\n(\d+), (\d+)");
    foreach (Match match in lines)
    {
        string control = match.Groups[1].Value;
        string text = match.Groups[2].Value;
        int x = Int32.Parse(match.Groups[3].Value);
        int y = Int32.Parse(match.Groups[4].Value);
        String cfont = match.Groups[5].Value;

            String fontName = cfont;
            String[] fontNameFields = fontName.Split(',');


            label.Font = new Font(fontNameFields[0], Single.Parse(fontNameFields[1]));
}

Stacktrace

---

   at Tabbed.Form1.FillCanvas() in C:\Documents and Settings\jay\My Documents\Visual Studio 2008\Projects\MYPROGGY\ MYPROGGY\Form1.cs:line 574
   at Tabbed.Form1.openbtn_Click(Object sender, EventArgs e) in C:\Documents and Settings\jay\My Documents\Visual Studio 2008\Projects\ MYPROGGY\ MYPROGGY\Form1.cs:line 802
   at System.Windows.Forms.ToolStripItem.RaiseEvent(Object key, EventArgs e)
   at System.Windows.Forms.ToolStripButton.OnClick(EventArgs e)
   at System.Windows.Forms.ToolStripItem.HandleClick(EventArgs e)
   at System.Windows.Forms.ToolStripItem.HandleMouseUp(MouseEventArgs e)
   at System.Windows.Forms.ToolStripItem.FireEventInteractive(EventArgs e, ToolStripItemEventType met)
   at System.Windows.Forms.ToolStripItem.FireEvent(EventArgs e, ToolStripItemEventType met)
   at System.Windows.Forms.ToolStrip.OnMouseUp(MouseEventArgs mea)
   at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
   at System.Windows.Forms.Control.WndProc(Message& m)
   at System.Windows.Forms.ScrollableControl.WndProc(Message& m)
   at System.Windows.Forms.ToolStrip.WndProc(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
   at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
   at System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG& msg)
   at System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(Int32 dwComponentID, Int32 reason, Int32 pvLoopData)
   at System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context)
   at System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context)
   at System.Windows.Forms.Application.Run(Form mainForm)
   at Tabbed.Program.Main(String[] args) in C:\Documents and Settings\jay\My Documents\Visual Studio 2008\Projects\ MYPROGGY\ MYPROGGY\Program.cs:line 27
   at System.AppDomain._nExecuteAssembly(Assembly assembly, String[] args)
   at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
   at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
   at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
   at System.Threading.ThreadHelper.ThreadStart()

回答1:

I suspect you're running into a line which doesn't contain a comma. Your sample data work okay:

using System;

class Test
{
    static void Main(string[] args)
    {
        String fontName = "Arial, 12.5";
        String[] fontNameFields = fontName.Split(',');
        String name = fontNameFields[0];
        float size = float.Parse(fontNameFields[1]);
        Console.WriteLine("{0}: {1}", name, size);
    }
}

Log (or pop up in a dialog box) fontName just before you try to create the font, and I'm sure that'll show you what's going on.

回答2:

Could it be your format contains a strange comma, or none at all?

Also could you provide code on the label as if it were a System.Web.UI.WebControls then Font has not got a setter.

Skeet's code above works fine for the given input. You're problem lies elsewhere.

回答3:

At first glance the code looks OK.

Have you checked that fontName is what you expect it to be (i.e. "Arial, 12.5") and what fontNameFields contains after the call to fontName.Split?

fontNameFields[0] -> "Arial"
fontNameFields[1] -> "12.5"

Without seeing the actual values I wouldn't like to suggest anything else.

EDIT

From your updated code I'd suggest that it's your regex that's failing. Try printing out the contents of the match.Groups array to check that you're parsing the input correctly.