在C＃中追加行 [英] Appending lines in C#

问题描述

我有一行代码可以为我打开控制台列表，工作正常。



LinkRecords.ForEach（record => Console.WriteLine（{ record.academic.Name}））;





现在我正在尝试将内容写入文件，我创建了一个ToString对象调用



公共覆盖字符串ToString（）{return（${this.academicName}）;}



和我的代码行是



File.AppendAllLines（@C：\\\\\\\\\\\\\\\\\\ ））;



我的错误信息在LinkRecords.ToString（）上，说我无法从'string'转换为'System.Collections.Generic.IEnumerable， < string>'



请通过此方式获得任何帮助。

解决方案

{this.academicName }}）;}



和我的代码行是



File.AppendAllLines（@C ：\pg\Gold\BRdata.txt，L inkRecords.ToString（））;



我的错误信息在LinkRecords.ToString（）上，说我无法从'string'转换为'System.Collections。 Generic.IEnumerable，< string>'



感谢您的任何帮助。

没有必要滥用字符串插值对于 ToString 方法 - 只需直接返回属性：

  public  覆盖  string  ToString（）
 {
 返回 此 .academic.Name; 
} 

File.AppendAllLines 方法要求第二个参数为 IEnumerable< string> ，但您传入的是字符串。您需要传入一个包含每个项目的字符串表示的列表。 LINQ使这一点变得特别简单：

 File.AppendAllLines（ @  C：\pg\Gold \BRdata.txt，LinkRecords.Select（r = >  r.ToString（））） ; 
 
  //  或者： 
 File.AppendAllLines（ @  C：\pg\Gold \BRdata.txt，LinkRecords.Select（r = < span class =code-keyword>>  r.academic.Name））; 

当你传递 LinkRecords 到 ToString（）方法，它被视为 LinkRecords.academicName 这是错误的因为你没有遍历 LinkRecords 。



改为覆盖 ToString（）方法，我会这样做。

  private   string  GetAcademicNames（LinkRecords linkRecords）
 {
 StringBuilder sb =  new  StringBuilder（）; 
 linkRecords.ForEach（record = >  sb.Append（record.academic.Name））; 
 
  return  sb.ToString（）; 
 
} 
 
 File.AppendAllLines（ @  C：\\ \\pg\Gold\BRdata.txt，GetAcademicNames（linkRecords））; 

I have a line of code that prints a list to console for me which works fine.

LinkRecords.ForEach(record => Console.WriteLine({record.academic.Name}));


Now I am trying to write the contents to a file, I created a ToString object called

public override string ToString(){return($"{this.academicName}");}

and my line of code is

File.AppendAllLines(@"C:\pg\Gold\BRdata.txt",LinkRecords.ToString());

My error message is on the LinkRecords.ToString() saying that I can not convert from 'string' to 'System.Collections.Generic.IEnumerable,<string>'

Appreciate any assistance with this please.

解决方案

"{this.academicName}");}

and my line of code is

File.AppendAllLines(@"C:\pg\Gold\BRdata.txt",LinkRecords.ToString());

My error message is on the LinkRecords.ToString() saying that I can not convert from 'string' to 'System.Collections.Generic.IEnumerable,<string>'

Appreciate any assistance with this please.

There's no need to abuse string interpolation for your ToString method - just return the property directly:

public override string ToString()
{
    return this.academic.Name;
}

The File.AppendAllLines method expects the second parameter to be an IEnumerable<string>, but you are passing in a string instead. You need to pass in a list containing the string representation of each item. LINQ makes this particularly easy:

File.AppendAllLines(@"C:\pg\Gold\BRdata.txt", LinkRecords.Select(r => r.ToString()));

// Or:
File.AppendAllLines(@"C:\pg\Gold\BRdata.txt", LinkRecords.Select(r => r.academic.Name));

When you are passing LinkRecords to ToString() method, its taken as LinkRecords.academicName which is wrong because you are not iterating through LinkRecords.

Instead overriding ToString() method, I would do it this way.

private string GetAcademicNames(LinkRecords linkRecords)
{
    StringBuilder sb = new StringBuilder();
    linkRecords.ForEach(record => sb.Append(record.academic.Name));

    return sb.ToString();

}

File.AppendAllLines(@"C:\pg\Gold\BRdata.txt",GetAcademicNames(linkRecords));

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