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VB生成二维码 Public Function CreateQRCode(ByVal barCode As String, ByVal UserID As String) As String Dim ImagePath As String = "" Try Dim qrCode As ThoughtWorks.QRCode.Codec.QRCodeEncoder = New ThoughtWorks.QRCode.Codec.QRCodeEncoder()

速度慢，效率低，问题多 1.1 Excel–>DateTable //引用命名空间 using ApExcel = Microsoft.Office.Interop.Excel; private void btnAppToDataTable_Click(object sender, EventArgs e) { DataTable dt = new DataTable(); string fileName = @"d:\库存变动信息.xlsx"; ApExcel.Appli.

依赖项 管理NuGet程序包（根据数据库选择安装） 完成表和实体的映射

from x in [源数据] where [筛选条件] select x 最后输出的就是x //由于Linq对于返回值类型并不是很明显，故可能出现隐式转换的问题，建议使用var //筛选出含有a的数据 string[] array = { "Zoffy", "Ultraman", "Seven", "Jack", "Ace", "Taro", "Leo", "Astra", "Eighty" }; var res = from u in array where u.Contains("a") sele