问题
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);
回答1:
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?
回答2:
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])
);
}
}
回答3:
I got it to work, check out this code amigo's
using (SqlBulkCopy bulkCopy = new SqlBulkCopy(sqlConnectionString, options))
{
ArrayList myList = new ArrayList();
foreach (ListItem li in lstOutcome.Items)
{
myList.Add(li);
}
bulkCopy.DestinationTableName = "Customers";
//amount to bulkcopy at once to prevent slowing with large imports
bulkCopy.BatchSize = 200;
SqlBulkCopyColumnMapping map1 = new SqlBulkCopyColumnMapping(myList[0].ToString(), "CustomerID");
bulkCopy.ColumnMappings.Add(map1);
SqlBulkCopyColumnMapping map2 = new SqlBulkCopyColumnMapping(myList[1].ToString(), "Name");
bulkCopy.ColumnMappings.Add(map2);
SqlBulkCopyColumnMapping map3 = new SqlBulkCopyColumnMapping(myList[2].ToString(), "Address");
bulkCopy.ColumnMappings.Add(map3);
SqlBulkCopyColumnMapping map4 = new SqlBulkCopyColumnMapping(myList[3].ToString(), "City");
bulkCopy.ColumnMappings.Add(map4);
SqlBulkCopyColumnMapping map5 = new SqlBulkCopyColumnMapping(myList[4].ToString(), "State");
bulkCopy.ColumnMappings.Add(map5);
SqlBulkCopyColumnMapping map6 = new SqlBulkCopyColumnMapping(myList[5].ToString(), "ZipCode");
bulkCopy.ColumnMappings.Add(map6);
SqlBulkCopyColumnMapping map7 = new SqlBulkCopyColumnMapping(myList[6].ToString(), "Phone");
bulkCopy.ColumnMappings.Add(map7);
SqlBulkCopyColumnMapping map8 = new SqlBulkCopyColumnMapping(myList[7].ToString(), "Email");
bulkCopy.ColumnMappings.Add(map8);
来源:https://stackoverflow.com/questions/1538817/looping-through-all-items-in-listbox