CODEWITHSUNDEEP
c#vb.net
Deke
Deke

Reputation: 117

VB InStr Equivalent in c#

I am not sure why I get the result of 0, which is the correct value of a

I have in 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 == 0 when converted to c#.

I have tried

int a = String.Compare(searched, sought);
int a = String.IndexOf(searched, sought);
int a = String.Equals(searched, sought);

Upvotes: 2

Views: 41525

Answers (7)

taha mosaad
taha mosaad

Reputation: 597

Simply You can use IndexOf()+1 to return 0 instead of -1 

int a = searched.IndexOf(sought)+1;

it work for me hop it help

Upvotes: 4

loowool
loowool

Reputation: 133

You can use the searched.Contains(sought)

Upvotes: 1

Deke
Deke

Reputation: 117

Works... Thanks Carsten

int b = searched.IndexOf(sought);

b = 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.

Upvotes: 0

Sergey Kalinichenko
Sergey Kalinichenko

Reputation: 726599

One difference between InStr and IndexOf's behavior is that InStr returns zero when the string is not found, while IndexOf returns -1. Using IndexOf is the idiomatic way of searching for substrings in C#, and the correct method to use in your situation.

If you would like to use InStr directly, you could do it by referencing Microsoft.VisualBasic assembly, and then calling InStr as a static method of the Strings class:

int a = Strings.InStr(searched, sought);

Upvotes: 4

CodeTherapist
CodeTherapist

Reputation: 2806

The three methods are all for different purposes and do not the same. That is why they have different names..

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().

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. 

bool a = String.Equals(searched, sought);

Determindes equality of two strings.

Upvotes: 0

CodeCaster
CodeCaster

Reputation: 151594

Strings in C# are zero-indexed. If a.IndexOf(b) returns 0, then string b is present in string a at position 0.

If the sought string is not in the input, IndexOf() returns -1.

Upvotes: 5

tichra
tichra

Reputation: 553

String.IndexOf should 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)

Upvotes: 0

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