Question

我有这样的代码

private void btnStartAnalysis_Click(object sender, EventArgs e)

            {

        //Checks for the selectedItem in the cmbOpearions dropdown and make call to appropriate functions.
        if((string) (cmbOperations.SelectedItem) == "PrimaryKeyTables")
            {
            //This is the function call for the primary key checking in DB
            GetPrimaryKeyTable();
            }

        //Checks for the selectedItem in the cmbOpearions dropdown and make call to appropriate functions.
        if((string) (cmbOperations.SelectedItem) == "NonPrimaryKeyTables")
            {
            //This is the function call for the nonPrimary key checking in DB
            GetNonPrimaryKeyTables();
            }

        //Checks for the selectedItem in the cmbOpearions dropdown and make call to appropriate functions.
        if((string) (cmbOperations.SelectedItem) == "ForeignKeyTables")
            {
            //This is the function call for the nonPrimary key checking in DB
            GetForeignKeyTables();
            }

        //Checks for the selectedItem in the cmbOpearions dropdown and make call to appropriate functions.
        if((string) (cmbOperations.SelectedItem) == "NonForeignKeyTables")
            {
            //This is the function call for the nonPrimary key checking in DB
            GetNonForeignKeyTables();
            }

        if((string) (cmbOperations.SelectedItem) == "UPPERCASEDTables")
            {
            //This is the function call for the nonPrimary key checking in DB
            GetTablesWithUpperCaseName();
            }

        if((string) (cmbOperations.SelectedItem) == "lowercasedtables")
            {
            //This is the function call for the nonPrimary key checking in DB
            GetTablesWithLowerCaseName();
            }
        }

但是这里使用（字符串）会在区分大小写的情况下产生问题。所以我想使用string.comapare代替（字符串）。

任何人都可以给我任何提示如何使用它。

Answer 1

我建议您使用：

// There's no point in casting it in every if statement
string selectedItem = (string) cmbOperations.SelectedItem;

if (selectedItem.Equals("NonPrimaryKeyTables",
                        StringComparison.CurrentCultureIgnoreCase))
{
    ...
}

选择正确的字符串比较可能很棘手。有关详细信息，请参阅此MSDN article。

我不会像其他人建议的那样建议使用Compare，因为它不是正确的重点 - Compare旨在用于测试哪些订单字符串应该在它们被分类时出现。这有允许你测试平等的副产品，但这不是主要目标。使用Equals表明你所关心的只是相等 - 如果两个字符串不相等，你不关心哪个会先出现。使用Compare会工作，但它不会让您的代码尽可能清晰地表达自己。

Answer 2

试试这个：

if (string.Compare((string) cmbOperations.SelectedItem, 
        "NonForeignKeyTables", true) == 0) // 0 result means same
    GetNonForeignKeyTables();

Answer 3

MSDN对string.compare方法有很好的解释。你只需要写

String.Compare (String, String)

比较你的字符串..用于Switch-case指令就可以了..

使用

String.Compare (String, String, boolean)

设置案例比较

Answer 4

对于不区分大小写的比较：

    string a = "text1";
    string b = "TeXt1";

    if(string.Compare( a, b, true ) == 0) {
        Console.WriteLine("Equal");
    }

string.compare和字符串进行比较

4 个答案: