我意识到这可能看起来像一个重复的问题(我见过很多其他问题询问有关此错误),但我找不到答案解释我遇到的问题。该错误是通过调用惹来附加信息:InvalidArgument ='0'的值对'索引'无效
invList.SelectedItems[0].Text //invList is a ListView
从我读过,当该指令引发的错误指示试图访问一个空列表(或阵列?)在ListView选择的项目。但是,我试图访问的ListView在指令执行时被项目填充。以下是我发出这个指令的方法:
方法1:deleteItem
public bool deleteItem()
{
if (invList.SelectedItems.Count == 0) //if no item selected...
{
MessageBox.Show("Error: No item selected", "Error", MessageBoxButtons.OK, MessageBoxIcon.Warning);
return false;
}
else
{
DialogResult dialogResult = MessageBox.Show(
"Are you sure you want to delete item: " + invList.SelectedItems[0].Text + "?",
"Error", MessageBoxButtons.YesNo, MessageBoxIcon.Warning);
if (dialogResult == DialogResult.Yes)
{
for (int i = 0; i < itemRecords.Count; i++)
{
if ((itemRecords[i].id.ToString() == invList.SelectedItems[0].Text) && (itemRecords[i].practice == clinicName))
{
itemRecords.Remove(itemRecords[i]);
listRefresh();
}
}
return true; //return true to indicate that data has been edited
}
return false; // return false to indicate that nothing has changed
}
}
方法2:的updateItem
public bool updateItem()
{
if (invList.SelectedItems.Count == 0) //if no item selected
{
MessageBox.Show("Error: No item selected", "Error", MessageBoxButtons.OK, MessageBoxIcon.Warning);
return false;
}
else
{
for (int i = 0; i < itemRecords.Count; i++)
{
//if id == the id of the selected item
if((itemRecords[i].id.ToString() == invList.SelectedItems[0].Text) && (itemRecords[i].practice == this.Text))
{
ItemAddition itemAddition = new ItemAddition(itemRecords, itemRecords[i], this);
itemAddition.ShowDialog();
}
}
return true;
}
}
listRefresh:
public void listRefresh()
{
invList.Items.Clear();
loadItems();
}
loadItems:
private void loadItems()
{
foreach (Record r in itemRecords)
{
if (r.practice == clinicName)
invList.Items.Add(r.ToString());
}
}
错误在第一个方法被调用时调用,但不在第二个方法被调用时调用。这种不一致是我混淆的原因。这种错误只会在第一种方法中出现,是否有某些原因?
你可以添加listRefresh方法的代码吗? – Damith
@Damith当然,我已经添加了它。 – AustinC
尝试修改'for(int i = 0; i