VS 2008 DataTable To Array?
May 19, 2011
This related to another question I have below that I beleive can be solved several different ways, this question is more specific to filling an array from a Datatable my DataTable has columns "Latitude" and "Longitude"From my message box I inserted to try and debug I seem to be just getting a -1. When i break point at the myCoords line it says there are 100 which is coorect there are 100 rows in my table. I know I am mising something stupid but being new I am unable to see my error.Also dont have the correct syntax for the debug.WriteLine Here is what I have so far:
[Code]...
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May 18, 2011
I have a Datatable consisting of columns with Latitude and longitude I want to be able to pass through each of those values in each row into an array that can then be passed through a function which gets the distance between each row and a static. In short I am trying to get distance between one location and various others that reside in a datatable that will vary in size. Right now with this existing code I am getting 6 different locations into an array:
HTML
Public Function GetCoords() As Coord()
Dim myCoords() As Coord
myCoords(0).Lat1 = CDbl(list1_Lat.Text)
myCoords(0).Lon1 = CDbl(List1_Lon.Text)
[Code] .....
If I am on the right track I think I need to create a new array that will accept Lat and Lon from each row in my Datatable? My end goal is to be able to find properties within a certain distance of a property. In other words "return all properties that are within .25 miles of 12 Maple Street". I thought if I had Lat and Lon of a certain property there would be a formula that would give me the max and min Lat and Lon to be within a .25 mile radius. I have searched for how to get a radius, but didnt come up with anything I could comprehend. So instead I thought I would just get each properties (row) return the distance in a new column then loop through the table to return properties within the desired distance .25 miles etc...
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Jan 10, 2009
my Code for fill datatable is :
n1.SelectCommand = New SqlCommand("Select Code from PriceDrystore where AirplanCode = '" & lblAPcode.Text & "' and substring(Code,8,1)='" & lblRoute.Text & "' ", DS)
n1.Fill(z1)result this code = 8 items
[Code]...
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May 21, 2011
I am trying to add the returned values from an array to the rows in a data table: Here is my current code the values load properly into the list box but not the table, each row ends up with the same value.
current code not working correctly
Dim dtrow As DataRow
Dim lat As Double = CDbl(34.213209)
[Code]....
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Mar 6, 2009
i've created a new access 2007 database + added a OLE Object field, that i've then pasted images into.
in vb2008 i've connected to the database + put the table into a datatable. so far it works ok.
when i try to convert the byte array to an image, it causes an error:
'A first chance exception of type 'System.ArgumentException' occurred in System.Drawing.dll'
heres the code i'm using:
vb
Dim arr() As Byte = DirectCast(record.Item(5), Byte())
pic.Image = Image.FromStream(New IO.MemoryStream(arr))
its loading the byte array properly, but the Image.FromStream line causes the error. i've used this method before with an earlier access database + it works.
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Apr 8, 2009
I am getting array of selected datarows from a datatable.select.I use the commands below to get that array or datarows
Dim foundRows() As DataRow
strExpression =
Here is what I tried.I have looked at examples by MS but they all just write to the screen and I have no interest in that.
For Each rowWork In foundRows
dtWork.Rows.Add(rowWork)
Next[code]....
"LineOfBusiness = 'CPP'"
foundRows = modXchange.pdtWork.Select(strExpression)
Now, I want to place the rows from foundrows into an empty data table.I did what I thought was the obvious but that only returns a bunch of rows with no data
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Mar 16, 2011
Is there a way to nest a datatable into another datatable? I know you can do this with gridviews but thats not what I'm looking for.
Also, I don't want to merge the datatables. What I'm trying to do is have a datatable with 2 columns and each column containing different datatables.
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May 6, 2010
I have a DataTable.Dim VoucherDT As New DataTable
[code]...
I could not assign a string value to integer or decimal column datatype. How can I convert the string value to dataColumn datatype?
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Sep 28, 2011
Since now, I have the following:
vb
Dim x = ( _
(From row In _Obj_DataSet.Tables(TableName).Rows() _
[code]....
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Jan 7, 2010
I have an requirement where I want to create a jagged array out of datatable and pass the jagged array over WCF.
Dim ObjJaggedArray(15)() As String
For Each row As DataRow In ObjTables.Tables(pKeyName).Rows
Try
'I DONT KNOW THIS PART
[code]....
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Nov 26, 2009
I am having some trouble with creating a simple function that converts a column of a datatable to an array (containing all numbers). Upon running it, it says "Index was outside the bounds of the array"; however, I couldn't understand why my function would create this problem.Also since I do not usually program using VB.Net, I am not sure if my function has other errors (like syntax errors).
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Dec 14, 2010
I have a datatable called dt which includes a column called type.I have a string array called typestringarray with about 15 members
I want to create a new datatable from the rows where type is a member of typestringarray[code]...
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May 5, 2010
I want to modify this function to populate an array with each item in the database.
I have tried various options, but I just can't get it to work[code]...
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May 5, 2010
I want to modify this function to populate an array with each item in the database.
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Mar 11, 2010
i have a datatable with some data, i need to select some of the data, and put that data in a new datatable.
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Mar 6, 2009
I've created a new access 2007 database + added a OLE Object field, that i've then pasted images into.in vb2008 I've connected to the database + put the table into a datatable. so far it works ok.when i try to convert the byte array to an image, it causes an error:
'A first chance exception of type 'System.ArgumentException' occurred in System.Drawing.dll'heres the code i'm using[code]....
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Apr 26, 2012
I have a array based on a structure that I want to build a datatable from. Here is what my structure looks like currently,
Public Structure QRQFiles
Public Complex As String
Public DescriptiveName As String[code]....
Since I have a structure with in the structure will I have to define two datatables to represent this?
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Apr 19, 2012
Is there a way of merging (importing or whatver is the correct terminology is) the data from an Array in to a DataTable woithout looping. I already know how to loop through the array to populate the DataTable with new DataRow but I'm looking for something much faster if it exists. I've got a 1 dimensional String array i.e. 'String()' that I need to populate a DataTable with new DataRows.
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Jun 23, 2009
I am attempting to retrieve byte array data from one in memory Datatable row and column and store the value retrieved in a different in memory DataTable row and column. The second DataTable is not associated with a database. I have not been able to save the byte array data in the second DataTable.
[Code]....
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Oct 27, 2010
I have a datatable with one column, I am trying to retrieve the values in the table into a string array using linq.
Dim dt As DataTable = DataAccessManager.ExecuteSelectQuery(selectStr).Tables(0)
Dim strArr() As String = (From dr As DataRow In dt.AsEnumerable.AsQueryable _
Select dr("MASTERID").ToString()).ToArray()
I get an error "Range variable cannot match name of a member of the 'Object' class"
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Jul 16, 2009
I have populated a datatable from a SQL stored procedure and need to do further filtering on the datatable. The datatable holds data that is returned from the SQL DB as varbinary and is stored in the datatable as a byte array. I am attempting to pass TheData!Hash which is also a byte array.
When I need to filter the datatable I have use the following:
Dim sQuery0 As String = "Hash=" & TheData!Hash
Dim ResultRows As DataRow() = dt.Select(sQuery0)
I understand that the TheData!Hash is a byte array and cannot be converted to a string in this way but how on earth do I pass the byte array in the Select filter expression?
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Oct 16, 2010
have a lot of experience with LINQ, but should your verb be attached to the array?
data.Tables("people").LoadDataRow(parsed(int1, 1), True) S/B
data.Tables("people").LoadDataRow(person.parsed(in t1, 1), True)
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Feb 4, 2010
I have a data table in a loop that adds rows on each loop. During the loop i collect an array of unknown size. At the end of the loop i want to add a new row to the datatable with eachelement of the array as a field.[code]I could hard code this if i knew how many item would be in the array but i dont.Is there any way i can loop through the array and append the value to a row?
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Apr 11, 2008
I want to modify this function to populate an array with each item in the database.I have tried various options, but I just can't get it to work
Private Function ConnectMe() As DataTable
Dim conn As String = "Server=192.168.0.36;Port=3306;Database=wswc;Uid=r oot;Pwd=Jack"
Dim cmd As String = "SELECT * FROM st_users"
[code]....
Instead of fill, I want to one by one add it to the dataset and also an array?
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Jul 18, 2011
I'm pulling data from a D3 database, using an api.
The api can do the following: Dim OBJ As Object = mvsp.MVResultSetGetRows.ToArray()
But how do I get that data into a datatable to use as the datasource for a DataGridView?
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Jun 21, 2012
I am trying to program a noise reduction algorithm that works with a set of datapoints in a VB.NET DataTable after being helped with my other question. Basically, I want to take two integers, a coordinate value (yCoord for example) and a threshold smoothing value (NoiseThresh), and take the average of the values in the range of (yCoord - NoiseThresh, yCoord + NoiseThresh) and store that number into an array. I'd repeat that process for each column (in this example) and end up with a one-dimensional array of average values. My questions are:
1) Did anything I just say make any sense ;), and
2) Can anyone help me with the code? I've got very little experience working with databases.
[Code]...
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Nov 27, 2009
Can I save an array into my .bin file then read the array again just like a string or Integer??
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Jun 2, 2010
is there is any direct method or function in array class that can check if any given byte array is a subarray of other array?or should i loop through the each byte of main array to see if smaller array exists in that or not?
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Nov 17, 2009
I have an assignment, and one of the requirements are to take a list of colors in an array and determine which letter, of the first letters of every color in the array, appears the most. (Essentially the mode, if converted to numerical values).
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Aug 18, 2011
I am trying to display value of the field ("UserID") for every row exists in datatable to checkboxlist(make the checkboxlist item selected).
I used for loop, but only the field value from last row of RoleUsers table is selected in the checkboxlist.
Here is my code
Private Sub DisplayRoleUser()
Dim conn As SqlConnection
Dim cmd As SqlCommand
[Code].....
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