c# - 如何将 vb .net 函数转换为 c#？

Question

我想将 vb .net 函数转换为 C#..我已经转换了它，但它没有按预期返回输出

VB.net 函数

 Public Function DecryptString(ByVal EncryptedString As String) As String

    Dim TempLine As String = Nothing
    Dim TempChar As String = Nothing
    Dim FinalStr As String = Nothing
    Dim i As Integer = 0
    Dim value As Integer = 0

    FinalStr = Nothing
    value = 0

    If EncryptedString <> "" Then
        For i = 1 To Len(EncryptedString)
            Try
                TempChar = Mid(EncryptedString, i, 1)
                value = Asc(TempChar)
                value = (value - (120))
                FinalStr = FinalStr & Chr(value)
            Catch
                DecryptString = ""
                Exit Function
            End Try
        Next
        DecryptString = FinalStr
        Exit Function
    End If

    DecryptString = ""
End Function

C#函数

 public string DecryptString(string EncryptedString)
    {
        string substr = null;
        char TempChar; int ExtraChars = 0; string ExtraOnes = "";
        string FinalStr = null;
        int i = 0;
        int value = 0;
        FinalStr = null;
        value = 0;
        if ((EncryptedString != ""))
        {
            for (i = 1; (i <= EncryptedString.Length); i++)
            {
                try
                {
                    substr = EncryptedString.Substring((i - 1), 1);
                    TempChar = Convert.ToChar(substr);
                    value = (value - 120);
                    FinalStr = (FinalStr + ((char)(value)));
                }
                catch (System.Exception e)
                {

                    // TODO: Exit Function: Warning!!! Need to return the value
                    return "";
                }
            }
            return FinalStr;
        }
        return "";
    }

我无法找到为什么它没有返回正确的输出

Answer 1

试试这个:

VB.Net to C# Conversion

public string DecryptString(string EncryptedString)
{
    string functionReturnValue = null;

    string TempLine = null;
    string TempChar = null;
    string FinalStr = null;
    int i = 0;
    int value = 0;

    FinalStr = null;
    value = 0;

    if (!string.IsNullOrEmpty(EncryptedString)) {
        for (i = 1; i <= Strings.Len(EncryptedString); i++) {
            try {
                TempChar = Strings.Mid(EncryptedString, i, 1);
                value = Strings.Asc(TempChar);
                value = (value - (120));
                FinalStr = FinalStr + Strings.Chr(value);
            } catch {
                functionReturnValue = "";
                return functionReturnValue;
            }
        }
        functionReturnValue = FinalStr;
        return functionReturnValue;
    }

    functionReturnValue = "";
    return functionReturnValue;
}

引用:

1.) Strings.Asc Method (String) :返回一个Integer值，代表一个字符对应的字符编码。(命名空间:Microsoft.VisualBasic)

2.) What's the equivalent of VB's Asc() and Chr() functions in C#? :

对于 Asc() ，您可以像这样将 char 转换为 int:

int i = (int)your_char;

对于 Chr()，您可以像这样从 int 转换回 char:

char c = (char)your_int;