解析字体信息并将其转换为 System.Drawing.Font

Question

我有一个包含这样的字体信息的文本文件：

Arial，12.5

...我需要将该信息读入 label.Font，如下所示：

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

...但我总是收到以下错误：

索引超出了数组的范围。

有人可以帮我解决这个问题吗？

谢谢 杰森。

我的代码：

    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()

Answer 1

我怀疑您遇到了不包含逗号的行。您的示例数据工作正常：

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);
    }
}

在尝试创建字体之前记录（或在对话框中弹出）fontName，我相信这会告诉您发生了什么。

Answer 2

难道你的格式包含一个奇怪的逗号，或者根本没有？

您还可以在标签上提供代码，就像它是 System.Web.UI.WebControls 一样，然后 Font 没有设置器。

上面的 Skeet 代码对于给定的输入工作得很好。你的问题出在其他地方。

Answer 3

乍一看，代码看起来没问题。

您是否检查过 fontName 是否符合您的预期（即“Arial，12.5”）以及调用 fontName.Split 之后 fontNameFields 包含的内容代码>?

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

在没有看到实际值的情况下，我不想提出任何其他建议。

编辑

从您更新的代码中我建议您的正则表达式失败了。尝试打印 match.Groups 数组的内容，以检查您是否正确解析输入。