文字选择器：动态修改字体，大小，粗细等font属性

WinForm- fontChooser.cs

// winForm
System.Windows.Forms.FontDialog fontDialog = new System.Windows.Forms.FontDialog();
if (fontDialog.ShowDialog() == System.Windows.Forms.DialogResult.OK)
{
    this.textAnnotation.Font.Size = fontDialog.Font.Size;
    this.textAnnotation.Font.Name = fontDialog.Font.Name;
    this.textAnnotation.Font.Underline = fontDialog.Font.Underline;
    this.textAnnotation.Font.Strikeout = fontDialog.Font.Strikeout;
    this.textAnnotation.Font.Bold = fontDialog.Font.Bold;
    this.textAnnotation.Font.Italic = fontDialog.Font.Italic;
}

WPF- FontChooser.cs

// http://stackoverflow.com/questions/11572636/set-value-to-fontdialog-in-wpf/11572921#11572921
// http://blogs.msdn.com/b/text/archive/2006/11/01/sample-font-chooser.aspx 
// 微软官方博客的字体选择器例子
//WPF
System.Windows.Forms.FontDialog fontDialog = new System.Windows.Forms.FontDialog();
if (fontDialog.ShowDialog() == System.Windows.Forms.DialogResult.OK)
{
    FontFamilyConverter ffc = new FontFamilyConverter();

    this.textAnnotation.FontSize = fontDialog.Font.Size;
    this.textAnnotation.FontFamily =(FontFamily)ffc.ConvertFromString(fontDialog.Font.Name);

    if (fontDialog.Font.Bold)
        textAnnotation.FontWeight = FontWeights.Bold;
    else
        textAnnotation.FontWeight = FontWeights.Normal;

    if (fontDialog.Font.Italic)
        textAnnotation.FontStyle = FontStyles.Italic;
    else
        textAnnotation.FontStyle = FontStyles.Normal;
}