WPF 代码片段

打开文件对话框

if (openFileDialog1.ShowDialog() == DialogResult.OK)
{
    label1.Text = "图片路径：" + openFileDialog1.FileName;
    imgpath = openFileDialog1.FileName;
}

图片转换

// imgpath 是输入图片的路径
Bitmap bt = new Bitmap(imgpath);
bt.Save("c:\\1.bmp", System.Drawing.Imaging.ImageFormat.Bmp);
MessageBox.Show("格式转换成功");

获取拖入文件的位置

要设置 AllowDrop 为 true。

private void Form1_DragEnter(object sender, DragEventArgs e)
{
    e.Effect = DragDropEffects.Copy; // 设置拖放操作中目标放置类型为复制
    String[] str_Drop = (String[])e.Data.GetData(DataFormats.FileDrop, true); // 检索数据格式相关联的数据
    MessageBox.Show(str_Drop[0]);
}

使用简单的 JSON 配置文件

using Newtonsoft.Json;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

/*
 * 需要添加引用 Newtonsoft.Json.dll
 */

namespace KeqingNiuza.RealtimeNotes.Models
{
    public class JsonConfigHelper
    {
        private static Dictionary<string, string> configDic = new Dictionary<string, string>();
        private readonly static string Conf = "NoteConfig.json";

        /// <summary>
        /// 读取配置信息
        /// </summary>
        /// <param name="key"></param>
        /// <returns></returns>
        public static string ReadConfig(string key)
        {
            if (File.Exists(Conf) == false) // 如果不存在就创建 file 文件夹
            {
                FileStream f = File.Create(Conf);
                f.Close();
            }
            string s = File.ReadAllText(Conf);
            try
            {
                configDic = JsonConvert.DeserializeObject<Dictionary<string, string>>(s);
            }
            catch
            {
                configDic = new Dictionary<string, string>();
            }

            if (configDic != null && configDic.ContainsKey(key))
            {
                return configDic[key];
            }
            else
            {
                return string.Empty;
            }
        }

        /// <summary>
        /// 添加配置信息
        /// </summary>
        /// <param name="key"></param>
        /// <param name="value"></param>
        public static void WriteConfig(string key, string value)
        {
            if (configDic == null)
            {
                configDic = new Dictionary<string, string>();
            }
            configDic[key] = value;
            string s = JsonConvert.SerializeObject(configDic);
            File.WriteAllText(Conf, s);
        }

        /// <summary>
        /// 删除配置信息
        /// </summary>
        /// <param name="key"></param>
        public static void DeleteConfig(string key)
        {
            if (configDic != null && configDic.ContainsKey(key))
            {
                configDic.Remove(key);
                string s = JsonConvert.SerializeObject(configDic);
                File.WriteAllText(Conf, s);
            }
        }
    }
}