Question

我试图让以下代码在ubuntu linux上运行的dotnet核心中运行 - 但是得到一个＆＃34;字符串不包含copy＆＃34;的定义。在这一行编译错误 - 在dotnet-core中不支持String.Copy：

         Attendance = String.Copy(markers) };

在dotnet Core中执行浅字符串复制的最佳方法是什么？我应该使用string.CopyTo吗？

由于

//I want to add an initial marker to each record
//based on the number of dates specified
//I want the lowest overhead when creating a string for each record

string markers = string.Join("", dates.Select(p => 'U').ToArray());
return logs.Aggregate( new List<MonthlyAttendanceReportRow>(), (rows, log) => {
     var match = rows.FirstOrDefault(p => p.EmployeeNo == log.EmployeeNo);
     if (match == null) {
         match = new MonthlyAttendanceReportRow() {
             EmployeeNo = log.EmployeeNo,
             Name = log.FirstName + " " + log.LastName,
             Attendance = String.Copy(markers) };
         rows.Add(match);
     } else {
     }
     return rows;
 });

Answer 1

试试这个：

string b = "bbb";
var a = new String(b.ToArray());
Console.WriteLine("Values are equal: {0}\n\nReferences are equal: {1}.", Object.Equals(a,b), Object.ReferenceEquals(a,b));

您可以在this fiddle上看到它正在运行。

Answer 2

要完成罗杰森的答案，您可以有一个扩展方法，该方法可以完全满足您的需求。

using System;
using System.IO;
using System.Linq;
using System.Collections.Generic;

namespace CSharp_Shell
{
public static class ext{
    public static string Copy(this string val){
        return new String(val.ToArray());
    }
}

    public static class Program 
    {
        public static void Main() 
        {
            string b = "bbb";
            var a = b.Copy();
            Console.WriteLine("Values are equal: {0}\n\nReferences are equal: {1}.", Object.Equals(a,b), Object.ReferenceEquals(a,b));
        }
    }
}

String.Copy替代dotnet核心

2 个答案: