CODEWITHSUNDEEP
c#
Running Rabbit
Running Rabbit

Reputation: 2720

How to get the last index of a string value

Below is the code:

PropertyInfo[] requestPropertyInfo;
requestPropertyInfo = typeof(CBNotesInqAndMaintRequest).GetProperties();

The CBNotesInqAndMaintRequest contains request data member noteline1---noteline18. once I read the name of one of the data member, I want to get its last index. For eg. If the name of the request object is "noteline8", I want to get the index as 8.

For this I have written the below code:

foreach (PropertyInfo reqPropertyInfo in requestPropertyInfo)
{
  index = reqPropertyInfo.Name.LastIndexOf("noteline");
}

But the above code is returning the index as 0.

Upvotes: 3

Views: 17510

Answers (8)

V.Kulkarni
V.Kulkarni

Reputation: 21

The simplest answer in my opinion is to get the count of the string and then subtract it by 1, will give you the last index of that string as shown below:-

int lastIndex= sampleString.Count-1; //sampleString is the string here.

Upvotes: 0

Gonzalo.-
Gonzalo.-

Reputation: 12682

Edit

Considering your comment, you should do:

Int32 index = Convert.ToInt32(reqPropertyInfo.Name.Replace("noteline",""));

Upvotes: 0

James
James

Reputation: 2463

I created a RegEx solution that doesn't matter what the property name is, but grabs the last digits and returns an integer

static int GetLastInteger( string name ) {

    int value;
    if( int.TryParse( name, out value ) ) {
        return value;
    }
    System.Text.RegularExpressions.Regex r = 
        new System.Text.RegularExpressions.Regex( @"[^0-9](\d+\b)" );

    System.Text.RegularExpressions.Match m = 
        r.Match( name );

    string strValue = m.Groups[1].Value;
    value = ( int.Parse( strValue ) );
    return value;
}

Usable in your example like so:

foreach (PropertyInfo reqPropertyInfo in requestPropertyInfo)
{
  index = GetLastInteger(reqPropertyInfo.Name);
}

Upvotes: 1

SSK .NET PRO
SSK .NET PRO

Reputation: 136

index = reqPropertyInfo.Name.Length -1;

incase of "noteline18", you want to find the index of 1 instead of 8, then

index = reqPropertyInfo.Name.LastIndexOf('e') + 1

Upvotes: 3

jeroenh
jeroenh

Reputation: 26792

It looks like you want to get the number after 'noteline'. If that is the case:

index = int.Parse(reqPropertyInfo.Name.SubString(8));

Upvotes: 2

billy
billy

Reputation: 1160

It that what you want ?

foreach (PropertyInfo reqPropertyInfo in requestPropertyInfo)
{
  index = int.Parse(reqPropertyInfo.Name.Replace("noteline",""));
}

Upvotes: 3

Moo-Juice
Moo-Juice

Reputation: 38820

The reason you are getting 0 back is that it is returning the last index of the entire string "noteline", which is of course, always at position 0. If you had "notelinenoteline", it would be returning "8".

Now, as to what you want to get back:

index = reqPropertyInfo.Name.Substring(8);

Upvotes: 1

Shane Fulmer
Shane Fulmer

Reputation: 7708

LastIndexOf returns the starting index of the string that you're looking for, which is why it returns 0.

Upvotes: 0

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