无法隐式转换List< double>' “加倍” [英] Cannot implicitly convert List<double>' to 'double'

问题描述

继续抛出，这部分代码出了什么问题，当我想返回单元格时，我收到此错误
无法将类型'System.Collections.Generic.List'隐式转换为'double'：

Keeps throwing, what is wrong in this part of my code, when I want to return cells I receive this error Cannot implicitly convert type 'System.Collections.Generic.List' to 'double' :

 public double readFileToList(string Path)
    {

        var cells = new List<double>();
        string path = label3.Text;

        if (File.Exists(path))
        {
            double temp = 0;
            cells.AddRange(File.ReadAllLines(path)
                .Where(line => double.TryParse(line, out temp))
                .Select(l => temp)
                .ToList());
            int totalCount = cells.Count();
            cellsNo.Text = totalCount.ToString();

        }

       return cells;

    }

推荐答案

是很难确定而又看不到整个函数，但是我的猜测是您将函数的返回类型设置为 double 而不是 List< double> 。

It is hard to say for certain without seeing your entire function but my guess would be that you have the return type of your function set to double instead of List<double>. This would cause the error you are seeing.

确认正在查看您的编辑，这是您的问题。将函数的返回类型更改为 List< double> ，您将可以使用！您的代码应如下所示：

Confirmed looking at your edit that this is your problem. Change the return type of your function to List<double> and you will be good to go! Your code should look like this:

public List<double> readFileToList(string Path)
    {

        var cells = new List<double>();
        string path = label3.Text;

        if (File.Exists(path))
        {
            double temp = 0;
            cells.AddRange(File.ReadAllLines(path)
                .Where(line => double.TryParse(line, out temp))
                .Select(l => temp)
                .ToList());
            int totalCount = cells.Count();
            cellsNo.Text = totalCount.ToString();

        }

       return cells;

    }

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