InstalledFontCollection ifc = new InstalledFontCollection();
private void EnumerateInstalledFonts(PaintEventArgs e)
{
    FontFamily[] families = ifc.Families;
    float x = 0.0F;
    float y = 0.0F;
    for (int i = 0; i < ifc.Families.Length; i++)
    {
        if (ifc.Families[i].IsStyleAvailable(FontStyle.Regular))
        {
            e.Graphics.DrawString(ifc.Families[i].Name, new Font(ifc.Families[i], 12), 
                Brushes.Black, x, y);
            y += 20;
            if (y % 700 == 0)
            {
                x += 140;
                y = 0;
            }
        }
    }
}

//引入命名空间
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

public class Form1 : Form
{
  private System.Windows.Forms.GroupBox groupBox1;
  private System.Windows.Forms.ComboBox lstFonts;
  private System.Windows.Forms.Label label1;
  private System.Windows.Forms.StatusStrip statusBar;
  private System.Windows.Forms.ToolStripStatusLabel statusLabel;

  public Form1() {
        InitializeComponent();
    System.Drawing.Text.InstalledFontCollection fonts = new System.Drawing.Text.InstalledFontCollection();
    foreach (FontFamily family in fonts.Families)
    {
      lstFonts.Items.Add(family.Name);
    }
  }

  private void lstFonts_SelectedIndexChanged(object sender, EventArgs e)
  {
        this.Invalidate();
  }

  private void Form1_Paint(object sender, PaintEventArgs e)
  {
    if (lstFonts.SelectedIndex != -1)
    {
            e.Graphics.DrawString(lstFonts.Text, new Font(lstFonts.Text, 50), Brushes.Black, 10, 50);
            statusBar.Items[0].Text = lstFonts.Text;
    }
  }

  private void InitializeComponent()
  {
    this.groupBox1 = new System.Windows.Forms.GroupBox();
    this.lstFonts = new System.Windows.Forms.ComboBox();
    this.label1 = new System.Windows.Forms.Label();
    this.statusBar = new System.Windows.Forms.StatusStrip();
    this.statusLabel = new System.Windows.Forms.ToolStripStatusLabel();
    this.groupBox1.SuspendLayout();
    this.statusBar.SuspendLayout();
    this.SuspendLayout();
    // 
    // groupBox1
    // 
    this.groupBox1.Anchor = ((System.Windows.Forms.AnchorStyles)(((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Left)
          | System.Windows.Forms.AnchorStyles.Right)));
    this.groupBox1.Controls.Add(this.lstFonts);
    this.groupBox1.Controls.Add(this.label1);
    this.groupBox1.Location = new System.Drawing.Point(7, 0);
    this.groupBox1.Name = "groupBox1";
    this.groupBox1.Size = new System.Drawing.Size(497, 40);
    this.groupBox1.TabIndex = 1;
    this.groupBox1.TabStop = false;
    // 
    // lstFonts
    // 
    this.lstFonts.DropDownStyle = System.Windows.Forms.ComboBoxStyle.DropDownList;
    this.lstFonts.DropDownWidth = 340;
    this.lstFonts.FormattingEnabled = true;
    this.lstFonts.Location = new System.Drawing.Point(100, 12);
    this.lstFonts.Name = "lstFonts";
    this.lstFonts.Size = new System.Drawing.Size(340, 21);
    this.lstFonts.TabIndex = 1;
    this.lstFonts.SelectedIndexChanged += new System.EventHandler(this.lstFonts_SelectedIndexChanged);
    // 
    // label1
    // 
    this.label1.Location = new System.Drawing.Point(12, 16);
    this.label1.Name = "label1";
    this.label1.Size = new System.Drawing.Size(80, 12);
    this.label1.TabIndex = 0;
    this.label1.Text = "Choose Font:";
    // 
    // statusBar
    // 
    this.statusBar.Items.AddRange(new System.Windows.Forms.ToolStripItem[] {
        this.statusLabel});
    this.statusBar.LayoutStyle = System.Windows.Forms.ToolStripLayoutStyle.Table;
    this.statusBar.Location = new System.Drawing.Point(0, 155);
    this.statusBar.Name = "statusBar";
    this.statusBar.Size = new System.Drawing.Size(516, 22);
    this.statusBar.TabIndex = 2;
    this.statusBar.Text = "statusStrip1";
    // 
    // statusLabel
    // 
    this.statusLabel.Name = "statusLabel";
    // 
    // Form1
    // 
    this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
    this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
    this.ClientSize = new System.Drawing.Size(516, 177);
    this.Controls.Add(this.groupBox1);
    this.Controls.Add(this.statusBar);
    this.Font = new System.Drawing.Font("Tahoma", 8.25F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
    this.Text = "Font Viewer";
    this.groupBox1.ResumeLayout(false);
    this.statusBar.ResumeLayout(false);
    this.ResumeLayout(false);
    this.PerformLayout();

  }

  [STAThread]
  static void Main()
  {
    Application.EnableVisualStyles();
    Application.Run(new Form1());
  }

}