vb.net VB InStr 等效于 c#
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VB InStr Equivalent in c#
提问by Deke
I am not sure why I get the result of 0, which is the correct value of a
我不知道为什么我得到的结果是0，这是正确的值a
I have in VB
我在 VB
Dim searched As String = "<results>" & vbCrLf & "<field name=\""FID\""/>" & vbCrLf & "<field name=\""StartFID\""/>" & vbCrLf & "<field name=\""Vertex1\""/>" & vbCrLf & "<field name=\""Vertex2\""/>" & vbCrLf & "<field name=\""Slope\""/>" & vbCrLf & ""
Dim sought As String = "<rs FID=\""87\"" StartFID=\""87\"" Vertex1=\""29\"" Vertex2=\""30\"" Slope=\""-1\""/>"
Dim a As Integer = InStr(searched, sought)
What I would like to do, is get the same result of a == 0when converted to c#.
我想做的是获得与a == 0转换为 c# 时相同的结果。
I have tried
我试过了
int a = String.Compare(searched, sought);
int a = String.IndexOf(searched, sought);
int a = String.Equals(searched, sought);
回答by CodeCaster
Strings in C# are zero-indexed. If a.IndexOf(b)returns 0, then string bis present in string aat position 0.
C# 中的字符串是零索引的。如果a.IndexOf(b)返回0，则字符串b出现在字符串a中的位置0。
If the sought string is not in the input, IndexOf()returns -1.
如果搜索的字符串不在输入中，则IndexOf()返回-1。
回答by dasblinkenlight
One difference between InStrand IndexOf's behavior is that InStrreturns zero when the string is not found, while IndexOfreturns -1. Using IndexOfis the idiomatic way of searching for substrings in C#, and the correct method to use in your situation.
InStr和IndexOf的行为之间的一个区别是InStr当找不到字符串时返回零，而IndexOf返回 -1。UsingIndexOf是在 C# 中搜索子字符串的惯用方法，也是在您的情况下使用的正确方法。
If you would like to use InStrdirectly, you could do it by referencing Microsoft.VisualBasicassembly, and then calling InStras a static method of the Stringsclass:
如果想InStr直接使用，可以通过引用Microsoft.VisualBasic程序集，然后InStr作为类的静态方法调用Strings：
int a = Strings.InStr(searched, sought);
回答by Deke
Works... Thanks Carsten
作品...谢谢卡斯滕
int b = searched.IndexOf(sought);
b = 0
乙 = 0
I see the problem I had now... when I move the string to a variable that calculates the string I get the error. I wasn't sure whether I had the correct use of InStr.
我看到了我现在遇到的问题......当我将字符串移动到计算字符串的变量时，我得到了错误。我不确定我是否正确使用了 InStr。
回答by taha mosaad
Simply You can use IndexOf()+1 to return 0 instead of -1
只需您可以使用 IndexOf()+1 返回 0 而不是 -1
int a = searched.IndexOf(sought)+1;
it work for me hop it help
它对我有用，希望有帮助
回答by CodeTherapist
The three methods are all for different purposes and do not the same. That is why they have different names..
这三种方法都是用于不同的目的，并不相同。这就是为什么他们有不同的名字..
int a = String.IndexOf(searched, sought);
This is the method that you should use and is exactly for that purpose.
Alternatively you could use string.Contains().
这是您应该使用的方法，并且正是为此目的。或者，您可以使用string.Contains().
int a = String.Compare(searched, sought);
Compares two specified String objects, ignoring or honoring their case, and returns an integer that indicates their relative position in the sort order.
比较两个指定的 String 对象，忽略或尊重它们的大小写，并返回一个整数，指示它们在排序顺序中的相对位置。
bool a = String.Equals(searched, sought);
Determindes equality of two strings.
确定两个字符串是否相等。
回答by tichra
String.IndexOfshould work, but if you truly want to use InStr, you can still do it. Just add a reference to Microsoft.VisualBasic.dll, and a "using Microsoft.VisualBasic;" at the top of your file, and you can use Strings.InStr:
Like Strings.InStr(searched, sought)
String.IndexOf应该可以工作，但如果你真的想使用 InStr，你仍然可以这样做。只需添加对 Microsoft.VisualBasic.dll 的引用和“使用 Microsoft.VisualBasic；” 在文件的顶部，您可以使用Strings.InStr：像Strings.InStr(searched, sought)
回答by loowool
You can use the searched.Contains(sought)
您可以使用 searched.Contains(sought)
