c# - 我收到“输入字符串不是给定格式”错误，因为在我的文本文件中输入的 Id 值

Question

我收到这条线的错误 me.Id = int.Parse(cols[0]); 在我的文本文件中输入。我正在解析我的字符串，但是当我调试文件时它给出了空白字符串“”。谁能帮我解决文件

public static List<MatchupEntryModel> ConvertToMatchupEntryModels(this List<string> lines)
    {
        //id = 0, TeamCompeting = 1, Score = 2, ParentCompeting = 3
        List<MatchupEntryModel> output = new List<MatchupEntryModel>();

        foreach(string line in lines)
        {
            string[] cols = line.Split(',');

            MatchupEntryModel me = new MatchupEntryModel();
           
            me.Id = int.Parse(cols[0]);
            
            if(cols[1].Length == 0)
            {
                me.TeamCompeting = null;
            }
            else
            {
                me.TeamCompeting = LookupTeamById(int.Parse(cols[1]));
            }
            
            me.Score = double.Parse(cols[2]);

            int parentId = 0;
            if(int.TryParse(cols[3], out parentId))
            {
                me.ParentMatchup = LookupMatchupById(parentId);
            }
            else
            {
                me.ParentMatchup = null;
            }

            output.Add(me);
        }
        return output;
        //List<PersonModel> output = new List<PersonModel>();

        //foreach (string line in lines)
        //{
        //    string[] cols = line.Split(',');

        //    PersonModel p = new PersonModel();
        //    p.Id = int.Parse(cols[0]);
        //    p.FirstName = cols[1];
        //    p.LastName = cols[2];
        //    p.EmailAddress = cols[3];
        //    p.CellphoneNumber = cols[4];
        //    output.Add(p);
        //}
        //return output;


    }

我还将我的保存条目发送到用于保存文件的文件功能。

public static void SaveEntryToFile(this MatchupEntryModel entry, string matchupEntryFile)
    {
        List<MatchupEntryModel> entries = 
        GlobalConfig.MatchupEntryFile.FullFilePath().LoadFile().ConvertToMatchupEntryModels();

        int currentId = 1;

        if(entries.Count > 0)
        {
            currentId = entries.OrderByDescending(x => x.Id).First().Id + 1;
        }

        entry.Id = currentId;
        entries.Add(entry);

        List<string> lines = new List<string>();

        //id = 0, TeamCompeting = 1, Score = 2, ParentCompeting = 3
        foreach (MatchupEntryModel e in entries)
        {
            string parent = "";
            if(e.ParentMatchup != null)
            {
                parent = e.ParentMatchup.Id.ToString();
            }
            string teamCompeting = "";
            if(e.TeamCompeting != null)
            {
                teamCompeting = e.TeamCompeting.Id.ToString();
            }
            
            lines.Add($"{ e.Id }, { teamCompeting }, { e.Score }, { parent }");
        }

        File.WriteAllLines(GlobalConfig.MatchupEntryFile.FullFilePath(), lines);
        //foreach (TeamModel t in models)
        //{
        //    lines.Add($"{ t.Id }, { t.TeamName }, { ConvertPeopleListToString(t.TeamMembers)}");
        //}

        //File.WriteAllLines(fileName.FullFilePath(), lines);
    }

标签： c#

Answer 1

使用 TryParse 而不是 Parse。它将返回 0 而不是抛出异常。