小编Reb*_*Dev的帖子

我正在使用Visual Studio 2013来创建Visual C#Windows窗体应用程序,而我没有使用Designer来设置窗体.

我正在尝试使用Dictionary来存储位图,以便我可以稍后通过名称调用它们.但是当我调试脚本时,我收到错误:

An unhandled exception of type 'System.NullReferenceException' occurred in SimpleForm.exe
Additional information: Object reference not set to an instance of an object.

从行:

width = imgLetters["a"].Width;

任何帮助将不胜感激.

减少仍会产生错误的代码版本:

using System;
using System.Drawing;
using System.Collections;
using System.Collections.Generic;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;

namespace SimpleForm
{

    public class Test : Form
    {

        static Bitmap bmpLetterA;
        static Bitmap bmpLetterB;
        static Bitmap bmpLetterC;
        private Dictionary<string, Bitmap> imgLetters;

        public Test()
        {

            ImgInitialize();
            ImgWidth();

        }

        private void ImgInitialize()
        {

            Dictionary<string, Bitmap> …