没有为类型'char'和整数定义运算符（ - ） [英] Operator (-) is not defined for types 'char' and integer

问题描述

你好，我在c＃中有一些代码我在vb中转换然后它抛出这个错误说

运算符（ - ）没有为类型'char'和整数定义

它在c＃中工作正常。



这里是c＃代码和vb代码

否则if（（c> ='0'&& c< ='9'）||（c> ='A'&& c< ='F'）||（c > ='a'&& c< ='f'））
 {
 //获取字符的值
 byte v =（byte）（c  -  0x30）; 
 if（c> ='A'&& c< ='F'）v =（byte）（c + 0x0a  - 'A'）; 
 if（c> ='a'&& c< ='f'）v =（byte）（c + 0x0a  - 'a'）; 
 
 if（gotFirstChar == false）
 {
 gotFirstChar = true; 
 accum = v; 
} 

在vb这是转换后的代码

 ElseIf（c> =0c AndAso c< =9c）OrElse（c> =Ac AndAso c< =Fc）OrElse（ c> =ac AndAso c< =fc）然后
'得到角色的值
  Dim v As Byte = CByte（c  - & H30）
如果c> =Ac又要c< =Fc那么
v = CByte（c +& HA  - Ac）
结束如果
如果c> =ac并且也是c< =fc然后
v = CByte（c +& HA  - ac）
结束如果 
 
如果gotFirstChar = False那么
 gotFirstChar = True 
 accum = v 
 

我尝试过：

 ElseIf（c> =0c AndAso c< = 9c）OrElse（c> =Ac AndAso c < =Fc）OrElse（c> =ac AndAso c< =fc）然后
'得到角色的值
 Dim v As Byte = CByte（c - & H30）
如果c> =Ac又要c< =Fc那么
v = CByte（c +& HA  - Ac）
结束如果
如果c> =ac又要c< =fc那么
v = CByte（c +& HA  - ac）
结束如果
 
如果gotFirstChar = False那么
 gotFirstChar = True 
 accum = v 
 

解决方案

您好会员11721323 ，



而不是使用Ac，ac等。，使用Asc（A）。



例如：

 ElseIf（c> = Asc（0）AndAlso c< = Asc（9））OrElse .................... .. 
 ............................................ ........... .................. 

这是因为在C＃中字符类型是隐式自动转换的，在VB.NET中是一个显式转换（转换，准确） 是必须的。 Asc 将字符转换为ASCII等效字符。

< = etc操作不是你的问题，那些与char一起工作正常。 （解决方案1）

  CByte （c +& HA  -   A c）

这是你的问题..你试着用整数来计算Char类型的东西。

我想知道你还想尝试归档什么？当然..获得HEX的整数..已经有.Net功能

  Dim  i 作为 整数 = 整数 .Parse（  12FF，Globalization.NumberStyles.HexNumber）

i => 4863

hello, i have some codes in c# which i converted in vb then it throws this error saying

operator (-) is not defined for types 'char' and integer 

and it works fine in c#.

here's the c# code and vb code

else if ((c >= '0' && c <= '9') || (c >= 'A' && c <= 'F') || (c >= 'a' && c <= 'f'))
                {
                    // get the character's value
                    byte v = (byte)(c - 0x30);
                    if (c >= 'A' && c <= 'F') v = (byte)(c + 0x0a - 'A');
                    if (c >= 'a' && c <= 'f') v = (byte)(c + 0x0a - 'a');

                    if (gotFirstChar == false)
                    {
                        gotFirstChar = true;
                        accum = v;
                    }

in the vb this is the converted code

ElseIf (c >= "0"c AndAlso c <= "9"c) OrElse (c >= "A"c AndAlso c <= "F"c) OrElse (c >= "a"c AndAlso c <= "f"c) Then
                   ' get the character's value
                   Dim v As Byte = CByte(c - &H30)
                   If c >= "A"c AndAlso c <= "F"c Then
                       v = CByte(c + &HA - "A"c)
                   End If
                   If c >= "a"c AndAlso c <= "f"c Then
                       v = CByte(c + &HA - "a"c)
                   End If

                   If gotFirstChar = False Then
                       gotFirstChar = True
                       accum = v

What I have tried:

ElseIf (c >= "0"c AndAlso c <= "9"c) OrElse (c >= "A"c AndAlso c <= "F"c) OrElse (c >= "a"c AndAlso c <= "f"c) Then
                   ' get the character's value
                   Dim v As Byte = CByte(c - &H30)
                   If c >= "A"c AndAlso c <= "F"c Then
                       v = CByte(c + &HA - "A"c)
                   End If
                   If c >= "a"c AndAlso c <= "f"c Then
                       v = CByte(c + &HA - "a"c)
                   End If

                   If gotFirstChar = False Then
                       gotFirstChar = True
                       accum = v

解决方案

Hi Member 11721323,

Rather than using "A"c, "a"c etc., use Asc("A").

E.g.:

ElseIf (c >= Asc("0") AndAlso c <= Asc("9")) OrElse ......................
.........................................................................

This is because in C# character types are automatically casted implicitly, in VB.NET an explicit cast (conversion, to be precise) is required. Asc converts the character to its ASCII equivalent.

That <= etc operations aren't your problem those work fine with char. (Solution 1)

CByte(c + &HA - "A"c)

This is your problem.. you try to calculate something of type Char with an Integer.
I wonder what are you trying to archive anyway? be course.. for getting the Integer of an HEX .. there are already .Net functions

Dim i As Integer = Integer.Parse("12FF", Globalization.NumberStyles.HexNumber)

i => 4863

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