StringComparison.OrdinalIgnoreCase

StringComparison.OrdinalIgnoreCase是一个枚举值，用于指定字符串比较的规则。它表示不区分大小写的字符串比较。

在.NET中，字符串比较可以使用String.Compare方法来执行。该方法接受两个字符串和一个StringComparison枚举值作为参数，用于指定比较规则。

当使用StringComparison.OrdinalIgnoreCase进行字符串比较时，会忽略字符串中的字符的大小写差异。这意味着比较时不会考虑字符的大小写，而只会根据字符的字母顺序进行比较。

以下是一个示例：

string str1 = "Hello";
string str2 = "hello";

int result = string.Compare(str1, str2, StringComparison.OrdinalIgnoreCase);

在上面的示例中，使用StringComparison.OrdinalIgnoreCase进行比较，结果将返回0，表示两个字符串相等，因为在不区分大小写的比较中，"Hello"和"hello"被认为是相等的。

相关问题

优化这段代码： var surGivenName = RemoteHelper.GetNameInfo(userName); var listData = listAllUsers?.Select(c => new DtEmployee { OutEmployeeId = c.LoginId, SurName = surGivenName.SurName, GivenName = surGivenName.GivenName, Gender = c.Sex == "F" ? (int)Sex.女 : (int)Sex.男, ReservationType = (int)ReservationType.仅限本人, CredentialType=(int)CredentialType.身份证, Email = c.Email, Mobile = c.MobilePhone, IdCard=c.IDCard, WorkingState = string.Equals(c.Status, "enabled", StringComparison.OrdinalIgnoreCase) ? (int)WorkingState.在职 : (int)WorkingState.离职 }).ToList();

为了优化这段代码，可以考虑将获取 surGivenName 的操作放在循环外面，避免重复调用 RemoteHelper.GetNameInfo(userName) 方法。

可以将 surGivenName.SurName 和 surGivenName.GivenName 存储到一个临时变量中，然后在循环中使用该变量。

另外，可以使用三元运算符简化 c.Sex == "F" ? (int)Sex.女 : (int)Sex.男 的写法。

下面是优化后的代码：

var surGivenName = RemoteHelper.GetNameInfo(userName);
var surName = surGivenName.SurName;
var givenName = surGivenName.GivenName;

var listData = listAllUsers?.Select(c => new DtEmployee
{
OutEmployeeId = c.LoginId,
SurName = surName,
GivenName = givenName,
Gender = c.Sex == "F" ? (int)Sex.女 : (int)Sex.男,
ReservationType = (int)ReservationType.仅限本人,
CredentialType = (int)CredentialType.身份证,
Email = c.Email,
Mobile = c.MobilePhone,
IdCard = c.IDCard,
WorkingState = string.Equals(c.Status, "enabled", StringComparison.OrdinalIgnoreCase) ? (int)WorkingState.在职 : (int)WorkingState.离职
}).ToList();

这样，代码就避免了重复调用 RemoteHelper.GetNameInfo(userName) 方法，提高了效率。同时，使用临时变量存储 surGivenName.SurName 和 surGivenName.GivenName，使代码更简洁易读。

private static Dictionary<string, int> GenerateFieldColumnMapping(List<FieldTitleMapping> attrs, Worksheet worksheet) { var propColumnIndexDict = new Dictionary<string, int>(); try { var importExcelTitleRow = worksheet.Cells.Rows[0]; if (importExcelTitleRow[0].IsMerged) { importExcelTitleRow = worksheet.Cells.Rows[1]; } var titleRowEnumerator = attrs.GetEnumerator(); var rowEnumerator = importExcelTitleRow.GetEnumerator(); while (titleRowEnumerator.MoveNext()) { var currentConfigField = titleRowEnumerator.Current; bool isGetMapperSuccess = false; var columIndex = 0; while (rowEnumerator.MoveNext()) { var currentCell = rowEnumerator.Current as Cell; if (!string.IsNullOrEmpty(currentCell.StringValue)) { var curTitleI18nName = currentConfigField.FieldAttribute.TitleKey.Trim(); if (curTitleI18nName.Equals(RemoveBadgeOfTitle(currentCell.StringValue), StringComparison.OrdinalIgnoreCase)) { propColumnIndexDict.Add(currentConfigField.FieldName, columIndex); isGetMapperSuccess = true; break; } } columIndex++; } if (!isGetMapperSuccess) { //propColumnIndexDict.Clear(); //return propColumnIndexDict; } rowEnumerator.Reset(); } } catch (Exception ex) { propColumnIndexDict.Clear(); } return propColumnIndexDict; } worksheet使用的是 Aspose.Cells，优化这段代码

首先，可以将 `importExcelTitleRow` 的判断和赋值提取到一个方法中，避免重复代码：

private static Row GetImportExcelTitleRow(Worksheet worksheet)
{
    var importExcelTitleRow = worksheet.Cells.Rows[0];

    if (importExcelTitleRow[0].IsMerged)
    {
        importExcelTitleRow = worksheet.Cells.Rows[1];
    }

    return importExcelTitleRow;
}

接着，可以将 `titleRowEnumerator` 和 `rowEnumerator` 的初始化提取到 `while` 循环外部，避免每次循环都创建新的实例：

var titleRowEnumerator = attrs.GetEnumerator();
var rowEnumerator = GetImportExcelTitleRow(worksheet).GetEnumerator();

while (titleRowEnumerator.MoveNext())
{
    var currentConfigField = titleRowEnumerator.Current;
    bool isGetMapperSuccess = false;
    var columIndex = 0;

    while (rowEnumerator.MoveNext())
    {
        var currentCell = rowEnumerator.Current as Cell;
        if (!string.IsNullOrEmpty(currentCell.StringValue))
        {
            var curTitleI18nName = currentConfigField.FieldAttribute.TitleKey.Trim();
            if (curTitleI18nName.Equals(RemoveBadgeOfTitle(currentCell.StringValue), StringComparison.OrdinalIgnoreCase))
            {
                propColumnIndexDict.Add(currentConfigField.FieldName, columIndex);
                isGetMapperSuccess = true;
                break;
            }
        }
        columIndex++;
    }

    if (!isGetMapperSuccess)
    {
        //propColumnIndexDict.Clear();
        //return propColumnIndexDict;
    }

    rowEnumerator.Reset();
}

最后，可以将 `columIndex` 的自增放到 `if` 判断的外部，避免不必要的计算：

var titleRowEnumerator = attrs.GetEnumerator();
var rowEnumerator = GetImportExcelTitleRow(worksheet).GetEnumerator();

while (titleRowEnumerator.MoveNext())
{
    var currentConfigField = titleRowEnumerator.Current;
    bool isGetMapperSuccess = false;
    var columIndex = 0;

    while (rowEnumerator.MoveNext())
    {
        var currentCell = rowEnumerator.Current as Cell;
        if (!string.IsNullOrEmpty(currentCell.StringValue))
        {
            var curTitleI18nName = currentConfigField.FieldAttribute.TitleKey.Trim();
            if (curTitleI18nName.Equals(RemoveBadgeOfTitle(currentCell.StringValue), StringComparison.OrdinalIgnoreCase))
            {
                propColumnIndexDict.Add(currentConfigField.FieldName, columIndex);
                isGetMapperSuccess = true;
                break;
            }
        }
        else
        {
            columIndex++;
        }
    }

    if (!isGetMapperSuccess)
    {
        //propColumnIndexDict.Clear();
        //return propColumnIndexDict;
    }

    rowEnumerator.Reset();
}

综上所述，优化后的代码如下：

private static Dictionary<string, int> GenerateFieldColumnMapping(List<FieldTitleMapping> attrs, Worksheet worksheet)
{
    var propColumnIndexDict = new Dictionary<string, int>();

    try
    {
        var titleRowEnumerator = attrs.GetEnumerator();
        var rowEnumerator = GetImportExcelTitleRow(worksheet).GetEnumerator();

        while (titleRowEnumerator.MoveNext())
        {
            var currentConfigField = titleRowEnumerator.Current;
            bool isGetMapperSuccess = false;
            var columIndex = 0;

            while (rowEnumerator.MoveNext())
            {
                var currentCell = rowEnumerator.Current as Cell;
                if (!string.IsNullOrEmpty(currentCell.StringValue))
                {
                    var curTitleI18nName = currentConfigField.FieldAttribute.TitleKey.Trim();
                    if (curTitleI18nName.Equals(RemoveBadgeOfTitle(currentCell.StringValue), StringComparison.OrdinalIgnoreCase))
                    {
                        propColumnIndexDict.Add(currentConfigField.FieldName, columIndex);
                        isGetMapperSuccess = true;
                        break;
                    }
                }
                else
                {
                    columIndex++;
                }
            }

            if (!isGetMapperSuccess)
            {
                //propColumnIndexDict.Clear();
                //return propColumnIndexDict;
            }

            rowEnumerator.Reset();
        }
    }
    catch (Exception ex)
    {
        propColumnIndexDict.Clear();
    }

    return propColumnIndexDict;
}

private static Row GetImportExcelTitleRow(Worksheet worksheet)
{
    var importExcelTitleRow = worksheet.Cells.Rows[0];

    if (importExcelTitleRow[0].IsMerged)
    {
        importExcelTitleRow = worksheet.Cells.Rows[1];
    }

    return importExcelTitleRow;
}