public Dictionary<string, List<BasicEntity>> ValidateProcess(string excelFile) { var readExcelResp = excelReader.ReadExcel(excelFile); foreach (var keyValuePair in readExcelResp) { var errors = new List<BasicEntity>(); foreach (var basicEntity in keyValuePair.Value) { var validationResult = ExecuteValidate(basicEntity); if (validationResult != null && !validationResult.IsValid) { errors.Add(basicEntity); foreach (var validationResultError in validationResult.Errors) { excelErrorLogService.AddErrorLog(basicEntity.MigrationRowNum.ToString(), validationResultError.ErrorMessage, keyValuePair.Key); } } } if (errors.Any()) { keyValuePair.Value.RemoveAll(i => errors.Contains(i)); } if (keyValuePair.Value.Any()) { var verifySet = new HashSet<string>(); var sameList = new List<BasicEntity>(); var identity = keyValuePair.Value[0].GetIdentity(); if (!string.IsNullOrEmpty(identity)) { var fields = identity.Split(""); foreach (var basicEntity in keyValuePair.Value) { List<string> fieldsValue = new(); foreach (var field in fields) { fieldsValue.Add(basicEntity.GetType() .GetField(field, BindingFlags.NonPublic | BindingFlags.Instance).GetValue(basicEntity) ?.ToString()); } var values = string.Join("", fieldsValue); if (verifySet.Contains(values)) { sameList.Add(basicEntity); _excelErrorLogService.AddErrorLog(basicEntity.MigrationRowNum.ToString(), $"Fields {fields} values repetition" , keyValuePair.Key); } else { verifySet.Add(values); } } } } } return readExcelResp; } 优化这段代码

这段代码可以进行以下优化：

1. 使用 LINQ 来简化代码，例如使用 `Where` 和 `Select` 来筛选和映射集合，使用 `Any` 和 `All` 来判断集合是否为空或满足条件。

2. 将重复的代码抽象成方法或者变量，避免代码重复。

3. 使用 `StringBuilder` 来拼接字符串，避免大量的字符串连接操作。

下面是优化后的代码：

public Dictionary<string, List<BasicEntity>> ValidateProcess(string excelFile) 
{
    var readExcelResp = excelReader.ReadExcel(excelFile);
    foreach (var keyValuePair in readExcelResp) 
    {
        var errors = keyValuePair.Value
            .Select(ExecuteValidate)
            .Where(validationResult => validationResult != null && !validationResult.IsValid)
            .SelectMany(validationResult => validationResult.Errors.Select(error => (validationResult.BasicEntity, error)))
            .ToList();

        errors.ForEach(error => _excelErrorLogService.AddErrorLog(error.BasicEntity.MigrationRowNum.ToString(), error.ErrorMessage, keyValuePair.Key));

        keyValuePair.Value.RemoveAll(errors.Select(error => error.BasicEntity).Contains);

        if (keyValuePair.Value.Any())
        {
            var identityFields = keyValuePair.Value.FirstOrDefault()?.GetIdentity()?.Split(";");

            if (identityFields != null)
            {
                var sameList = new List<BasicEntity>();
                var verifySet = new HashSet<string>();

                foreach (var basicEntity in keyValuePair.Value)
                {
                    var values = identityFields.Select(field => basicEntity.GetType().GetField(field, BindingFlags.NonPublic | BindingFlags.Instance)?.GetValue(basicEntity)?.ToString()).Aggregate(new StringBuilder(), (sb, value) => sb.Append(value)).ToString();

                    if (verifySet.Contains(values))
                    {
                        sameList.Add(basicEntity);
                        _excelErrorLogService.AddErrorLog(basicEntity.MigrationRowNum.ToString(), $"Fields {string.Join(",", identityFields)} values repetition", keyValuePair.Key);
                    }
                    else
                    {
                        verifySet.Add(values);
                    }
                }

                keyValuePair.Value.RemoveAll(sameList.Contains);
            }
        }
    }

    return readExcelResp;
}