WinFormTools/WinformDevFramework/Common/ExtensionMethod.cs

using NVelocity.Runtime.Parser.Node;
using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using System.Text;
using System.Threading.Tasks;

namespace WinformDevFramework
{
    public static class ExtensionMethod
    {
        public static Image Base64ToImage(this string base64str)
        {
            if (string.IsNullOrEmpty(base64str))
            {
                return null;
            }
            byte[] imageBytes = Convert.FromBase64String(base64str);
            using (MemoryStream memoryStream = new MemoryStream(imageBytes))
            {
                return Image.FromStream(memoryStream);
            }
        }

        public static string ImageToBase64(this Image image)
        {
            using (MemoryStream memoryStream = new MemoryStream())
            {
                image.Save(memoryStream, image.RawFormat);
                byte[] imageBytes = memoryStream.ToArray();
                return Convert.ToBase64String(imageBytes);
            }
        }
        /// <summary>
        /// combobox搜索功能
        /// </summary>
        /// <param name="cb"></param>
        /// <param name="strList"></param>
        public static void TextUpdateFunction(this ComboBox cb, string[] strList)
        {
            try
            {
                {
                    string s = cb.Text;  //获取cb_material控件输入内
                    List<string[]> strListNew = new List<string[]>();
                    //清空combobox
                    cb.DataSource = null;
                    cb.Items.Clear();
                    //遍历全部原始数据
                    foreach (var item in strList)
                    {
                        // 根据输入的值模糊查询,将符合条件的值存储到新strListNew的集合里面
                        if (item.Contains(s))
                        {
                            strListNew.Add(new string[] { "", item });
                        }
                    }
                    if (strListNew.Count >= 1) // 存在符合条件的内容
                    {
                        //将符合条件的内容加到combobox中
                        //this.ComCB.Items.AddRange(strListNew.ToArray());
                        GetComCB(cb, strListNew);
                    }
                    // 不存在符合条件时
                    //设置光标位置，若不设置：光标位置始终保持在第一列，造成输入关键词的倒序排列
                    cb.SelectionStart = cb.Text.Length;  // 设置光标位置，若不设置：光标位置始终保持在第一列，造成输入关键词的倒序排列
                    //cb.Cursor = Cursors.Default; //保持鼠标指针原来状态，有时候鼠标指针会被下拉框覆盖，所以要进行一次设置
                    cb.DroppedDown = true; // 自动弹出下拉框
                    cb.MaxDropDownItems = 8; // 自动弹出下拉框
                }
            }
            catch (ArgumentOutOfRangeException e)
            {
                Console.WriteLine(e);
            }
        }
        /// <summary>
        /// 设置combobox的item值
        /// </summary>
        /// <param name="cb">ComboBox</param>
        public static void GetComCB(ComboBox cb, List<string[]> res)
        {
            ArrayList mylist = new ArrayList();
            foreach (var item in res)
            {
                mylist.Add(item[1]);
            }
            cb.Items.AddRange(mylist.ToArray());
        }


    }
}