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var optionalString: String? = "facial"; var greeting = "hi"; if let name = optionalString { //把optionalString复制给一个临时变量 name. 可以判断optionalString是否有值, g 阅读全文
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There’s an even simpler way to include values in strings: Write the value in parentheses, and write a backslash (\) before the parentheses. This is kn 阅读全文
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add a class: public class ExportAttribute : Attribute { public int FieldOrder { get; set; } public ExportAttribute() { } }add [ExportAttribute(FieldOr 阅读全文
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using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; using ClosedXML.Excel; using Syste 阅读全文