Looping through all items in ListBox?
Solution 1
A more efficient way to write your answer would be like this:
static readonly string[] FieldNames = new string[] { "CustomerID", "Name", "Address", ..., "Email" };
using(SqlBulkCopy bulkCopy = new SqlBulkCopy(sqlConnectionString, options)) {
bulkCopy.DestinationTableName = "Customers";
//amount to bulkcopy at once to prevent slowing with large imports
bulkCopy.BatchSize = 200;
for(int i = 0; i < FieldNames.Length; i++) {
bulkCopy.ColumnMappings.Add(
new SqlBulkCopyColumnMapping(lstOutcome.Items[i].ToString(), FieldNames[i])
);
}
}
Solution 2
You need to put the textboxes in an array, like this:
Textbox[] textboxes = new Textbox[] { textbox, textbox2, textbox3 };
for (int i = 0; i < listBox1.Items.Count; i++) {
textboxes[i].Text = "Item: " + listBox1.Items[i].ToString();
}
Note that if there are more than three items in the listbox, this will fail because it will run out of textboxes. For a more complete solution, please add some context. What are the textboxes for? What is the data in the listbox coming from?
SLaks
Schabse Laks Developer, C# MVP (2010 - 2018) Contact: [email protected] Twitter: @Schabse I've been programming since I was 12. I started with VB6, then moved to C# 2 Beta 2 when I was 14. I never liked VB6, but I found my calling in C#, and I've stuck with it ever since. Since then, I've also mastered web development with jQuery. I also wrote a jQuery tutorial. I'm now working at Google within the Google Docs team. My best of SO: Tracking down a bug in the .Net runtime An exercise in psychic debugging (see the question history) Working around a C# compiler limitation Decoding a Javascript virus jQuery selector magic Simple coroutines using iterators Understanding Javascript scoping in inline event handlers WM_NCHITTEST magic A bug in the C# compiler
Updated on July 18, 2022Comments
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SLaks almost 2 years
I have a list box which is populated by this code:
- lstOutcome.Items.Add(lstMap.SelectedItem.Text);
In the listbox lstOutcome, I need to be able to loop through the listbox and be able to take the value of the first,second, etc, list items.
The reason I need to loop through each line and grab the value of that line is so I can use whatever value was in that line for populating something else.
For example, in my list box I have:
- 1
- 2
- 3
I need to be able to loop through the listbox on button click and have the values assigned to txtboxes:
- textbox1.Text = 'item 1 in the listbox';
- textbox2.Text = 'item 2 in the listbox';
- textbox3.Text = 'item 3 in the listbox';
I am not sure if I need an array or how this can be accomplished. The point of this example is that I will actually be using the items in the listbox to map columns. I am importing an Microsoft Excel spreadsheet. In lstMap I have the column names and I am trying to get the column names to match my database. Using this code I am trying to take the values of the listbox:
foreach(object li in lstOutcome.Items) { bulkCopy.DestinationTableName = "Customers"; //Amount to bulkcopy at once to prevent slowing with large imports. bulkCopy.BatchSize = 200; SqlBulkCopyColumnMapping map1 = new SqlBulkCopyColumnMapping(li.ToString(), "CustomerID"); bulkCopy.ColumnMappings.Add(map1);
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Admin over 14 yearsactually this is a hypothetical example, I am going to be taking the value of the listitems and plugging them into a column mapping, but there will never be more items than textboxes if you think about it like that
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Admin over 14 yearssee what i mean after I put in the update? I will never have more columns in the listbox than columns in the database, but this solution I feel can come easily, I just dont know how to loop thru the listbox and grab EACH list item and assign it a value, like grabbing the text 1 from the listbox and assigning it a value in an array
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SLaks over 14 yearsIt's ASP.Net. No other framework has a ListBoxItem class (lstMap.SelectedItem.Text, near the top)
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Admin over 14 yearsok I get what you're saying. I am going to do a little tweaking.
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Admin over 14 yearsmeh couldnt get it to work, cant interchange textbox with SqlBulkCopyColumnMapping
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SLaks over 14 yearsYou don't need to create an ArrayList. Instead, you can write
lstOutcome.Items[4].ToString()
. Also, you don't need a separate variable for each mapping. Instead, you can writebulkCopy.ColumnMappings.Add(new SqlBulkCopyColumnMapping(...))