Question

我正在使用Filehelpers并导入了一个csv文件。一切正常，但现在我想验证导入的字段的长度。

[DelimitedRecord(";")]
public class ImportFile
{
    public string Name;
    public string NameSurname;
}

是否有可能的方法，我可以创建一个属性＆＃34; MaxLength＆＃34;如果InputString大于我的MaxLength Attribut，它会拆分输入字符串或抛出异常？我发现的唯一的东西是FieldFlixedLength，但那只是Split，输入文件在字段中。

Answer 1

您可以按如下方式实施AfterRead事件：

[DelimitedRecord(";")]
public class ImportRecord : INotifyRead<ImportRecord>
{
    public string Name;         
    public string NameSurname;

    public void BeforeRead(BeforeReadEventArgs<ImportRecord> e)
    {
    }

    public void AfterRead(AfterReadEventArgs<ImportRecord> e)
    {
        if (e.Record.Name.Length > 20)
            throw new Exception("Line " + e.LineNumber + ": First name is too long");

        if (e.Record.NameSurname.Length > 20)
            throw new Exception("Line " + e.LineNumber + ": Surname name is too long");
    }

}

class Program
{
    static void Main(string[] args)
    {
        var engine = new FileHelperEngine<ImportRecord>();
        engine.ErrorMode = ErrorMode.SaveAndContinue;

        string fileAsString = "Firstname;SurnameIsAVeryLongName" + Environment.NewLine
                            + "FirstName;SurnameIsShort";

        ImportRecord[] validRecords = engine.ReadString(fileAsString);

        Console.ForegroundColor = ConsoleColor.Red;
        foreach (ErrorInfo error in engine.ErrorManager.Errors)
        {
            Console.WriteLine(error.ExceptionInfo.Message);
        }

        Console.ForegroundColor = ConsoleColor.White;            
        foreach (ImportRecord validRecord in validRecords)
        {
            Console.WriteLine(String.Format("Successfully read record: {0} {1}", validRecord.Name, validRecord.NameSurname));
        }

        Console.WriteLine("Press any key...");
        Console.ReadKey();
    }
}

Filehelpers字段最大长度

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