How do I use the Indexof Method to search for an Index a number? The number will be different on each line of the file. Each array has a name and a different zip code. I want to tell it to search for the first number in the line. Everything before that index will be first name, last name, and then zip code.
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Can anyone give a good explanation of how the indexof method works and what is meant by "Index" ?
View 3 Repliesi want index of the first value in a string Without calling IndexOf.
Like, " I am going" and my search value is "am"
so it should give me index value as "2".
I am trying to do a search on a index/row number taken from a dataview i.e. I enter 379437 in the input box which I know has a index/row number of 6. Now when I replace the Rows(index) with a Rows(6) I get the results that I want. When I run the code below the index comes out as 75 which displays the first row from the dataset which is a completely different set of results.
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I need to find a method of looping through a listbox and retrieving the index number and values - quite straightforward in asp, but turning out to be something of a nightmare in winforms!Here is the scenario - The user can add values in a textbox, that are in turn added to a DataTable that gives it a unique ID and a row number, this is then bound to the listbox. The user can then move the items up or down the list by adjusting the row number in the datatable and rebinding to the listbox..
The problem that I am hitting is when the user needs to delete an item -the first part is easy - delete from the DataTable and rebind to the listbox. The bit where I hit the proverbial brick wall is needing to loop through the listbox rows and getting both the index number and the ValueMember - that way I can change the row numbers in the DataTable based on the index number against the ID number.
My assignment in Visual Basic 2010 is to build a order form that has two text boxes, one for the name and the other for the address. And we're suppose to use the IndexOf method on the address. I understand that IndexOf returns the position of a character and the number of characters. What would be the purpose of using the IndexOf method on the address in this instance? I don't understand what I would be searching for when the user types in it's address that's going to be numbers and string characters. I think I understand what the IndexOf method does, somewhat, but why and what would I use it to achieve?
View 3 RepliesAs i described below code i am trying to find the the similar class from the ClassArray using the indexof method. How can we invoke name property inside the indexof method
Public Class Form1
Private Sub Button1_Click(sender As System.Object, e As System.EventArgs) Handles Button1.Click
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I have 10 lines of array that are first name space last name space zip code. All the zip codes start with different numbers. Is there a way to replace the #1 in the indexof below so that it searches for any number character instead?
'open file
inFile = IO.File.OpenText("Names.txt")
'process the loop instruct until end of file
intSubscript = 0
[code].....
What if we wanted seconded index of? ' example this is a long message after a few spaces. If we wanted to split this message from the second index of " " (space) returned result long message after a few spaces
View 3 RepliesTrying to input a high setpoint, low setpoint, a % load, and number of compressors, then calculate the temp that all compressors are off. Then build a datagridview with the staging of compressors from all off to all on for each compressor up to 10 compressors.I am trying to insert headers from 1 to 10 compressors (Variable) with the text "Comp1", "Comp2", etc....Two rows with header. I am trying to use an array with index number to insert the text, but that is where my problem happens."Index was out of range".Here is my code
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim i As Integer, num1, num2, num3, num4, alloff As Single, stg As Single
TextBox1.Focus()[code].....
How can I search, for example ID Number, and want to highlight the listview item found in search from my first form? I'm using combobox from my second form to search.
View 6 RepliesI need to get the ID number from an acces table (I am working with GIS .. I do not nkow if that helps) from a record (I do not know if I am using the correct technical words here)
View 4 RepliesIs there any way by which I can add a location to Windows 7 search index and make it indexed in .Net?
View 1 RepliesHow on specific behaviour can be created in a custom class. I want to be able to create a custom class (a kind of list) where I can access the items by their index (this is the easy part), but also by a string that would describe them. Here is an example:
MyClass(1).SomeProperty = "NewValue"
MyClass("Item1").SomeProperty = "NewValue"
You can see this kind of behaviour in dataset for example where you can select a table by its name or by its index like this :
DataSet.Tables("MyTable").Rows...
DataSet.Tables(1).Rows...
How can I create a custom class that will behave like this?
getting started with creating an index search for parallel arrays. When the user enters the specific "code", and presses enter, the information in the other arrays should be displayed based on its matching index. I'm pretty sure I use "For i = " but I'm lost. I have my arrays set up like this:
Dim code(9) As String
code(0) = "A"
code(1) = "H"
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How to search and get position a string in a big file?I have searched in forum2 and get several ways to search for strings in files, but it is not for large files above 500 mb,I have just been make a function to search string and get its index,but it is very slow and uses lots of RAM.This is my function
Function StringInFile(ByRef fs As FileStream, ByRef
substring As String, Optional ByVal occurence As Integer = 1,_
Optional ByVal start As Integer = 0, Optional ByVal count As Integer = -1) As Integer
[code]....
Given an enum similar to this:
Friend Enum TestValue As Int32
tstNotSet = -1
tstA = 0
[code]....
As noted in my comment to Jon Skeet, this construct, along with the rest of the Object's components, executes 100,000 times in a profiling loop in ~570ms (rough average of 3-5 runs).
Exchanging the above construct out with a smaller Array.IndexOf construct loops 100,000 times in ~630ms (again, 3-5 runs, rough average, the whole Object). The new construct looks like this:
Dim p As Int32
p = Array.IndexOf(TestValues, s)
If p <> tstNotSet Then
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I have been searching for a while now, but I still can't seem to figure this out. I wrote a rather large program, and to make things more efficient I started to create structs to store more info in a variable.All was well replacing my old code with new code, till I reached a certain point and found that blindly using a loop of integers to access the indexes of the array wouldn't work anymore... I need to access a specific struct by the information contained in a single variable within the struct (like a hashtable key), but can't seem to figure out how.
Is it possible for me to go through my array indexes in a fashion like this?:
Dim myArray(TableCount) As myStruct
Dim TableName As String = "SomeTable"
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I have the following code:
indexOfSearchText = TextBox1.Find(item, start, TextBox1.TextLength, RichTextBoxFinds.WholeWord)
If indexOfSearchText <> -1 Then
startindex = indexOfSearchText
End If
But I want just the first result, if I have an example text:
then it searches twice "is", I just want the first "is".
Sometime in VB.net i have something like:[code]But if i need the index number, i have to change it to [code]Is there another way of getting the index?
View 2 Replieshighlight listview item from mysql search statement then get the index?
View 6 RepliesI need to create a telephone directory with search option(textbox). I use sql db as backend and vb.net for frontend. In this the user must search for a particular name using the textbox and the results have to be displayed in the gridview. how to do this?
View 1 RepliesI need to find out how I can get the index number of a brand new row I just saved.
The table is set up with primary field as Identity (It auto generates the number
in column(0)- "DoorID")
Eg:
dim ds as dataset = DoorsData
dim dt as datatable = ds.Tables("Door")
dim dr as datarow = dt.new row
dr.item(1) = txtDoorNumber.text
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What is the primary key value of the row I just added? I have another table with Col(1) as "DoorID" and Col(2) as "KeyID" I need to know what the ID numbers are so I can fill this table next.
I have having problems with the code listed below. I'm trying to re-call the name of a product from a table when I know the productID which is the primary key but i'm getting court up as the primary keys do not match thier row numbers e.g. product with an id of 10 may be on row 2 so when I run my program i get the product name of the product on row 10 not on row 2. The database I'm using is microsoft trial database NorthWind. The rest of the code calculates the number, value and sum of the order.
Dim
i, j, k As
Integer
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How can to make control arrays in vb.net ? there is no INDEX property or Load method like VB6. so how i can do it ?
View 5 Repliesi am trying to find a way to add something to one of the columns in my listview. The way my code is setup is like this:
While dr.Read()
If dr.IsDBNull(12) Then
objItem = lstMaster.Items.Add("nothing")
[code].....
I would like to format output to a property of a custom control I have made.For instance I have a literal control in my control and when populated I want to check if it is longer than 30 characters long, if so, then go to the next space (as to not cut the word off) after the 30th character and place a <br /> tag in to place the next 30 characters on the next line.So if there were 100 characters in a string, there would be 3 line breaks in the label.I have the looping worked out to get the label populated but cannot get how to dymaically create the array based on the string lenth property and index of method.
View 7 RepliesI have developed an application in VB2008/MySql as database.I did serach record method but i need serach record using(Graterthan) >1000 and <5000(LessThan).Have a look at the normal search record code .
searchquery = "select date,PartNo,Customer,Requestor,Quotes,SO,WO,Vendor,Quantity,Turn,price,Lot,layers,x,y,Thick,Material ,MinLine,Minspace,MinDrill,ViaFill,impedence,plating,PacDesign,comments from quotes where"
searchquery = searchquery + " " + de.Key + "=" + "'" + de.Value.ToString() + "'"
I am trying to sort a column in DGV as follows:
DataGridView8.Sort(DataGridView8.Columns(0), ListSortDirection.Ascending)
However, I want to use the name of the column and extract the index number in the first parameter of the Sort method. However this fails:
DataGridView8.Sort(DataGridView8.Columns("Date").Index, ListSortDirection.Ascending)
Is there any way to find the index number of Child Node.in above shown example is it possible to find Node index of -Node32
View 4 Replies