您好,如果我将(i)值放入itemsWS.getItemInfo(itemLis [i] .ToString()),您将得到“索引超出数组范围”
object[] itemDetails;
object[] itemLis = itemsWS.searchItem("", "bread", "all");
int xs = 35;
int clefts = 0;
for (int i = 0; i < itemLis.Length; i++)
{
itemDetails = itemsWS.getItemInfo(itemLis[i].ToString());
Button myButtons = new Button();
myButtons.Click += delegate
{
dataGridView1.ColumnCount = 11;
dataGridView1.Columns[0].Name = "Item Code";
dataGridView1.Columns[1].Name = "Description";
dataGridView1.Columns[2].Name = "Sale Price";
dataGridView1.Columns[3].Name = "Category";
dataGridView1.Columns[4].Name = "Type";
dataGridView1.Columns[5].Name = "Status";
dataGridView1.Columns[6].Name = "Low Count";
dataGridView1.Columns[7].Name = "Medium Count";
dataGridView1.Columns[8].Name = "High Count";
dataGridView1.Columns[9].Name = "Item Picture";
dataGridView1.Columns[10].Name = "TEST";
//here is where i'm getting error if i put i on the []
itemDetail = itemsWS.getItemInfo(itemLi[i].ToString());
//
dataGridView1.Rows.Add(itemDetail);
MessageBox.Show("data grid displayed!");
};
myButtons.Text = itemDetails[1].ToString() + "\n " + itemDetails[2].ToString();
myButtons.Top = cleft * 180;
myButtons.Left = 70;
myButtons.Location = new Point(xs, clefts);
myButtons.Size = new Size(100, 60);
tabPage1.Controls.Add(myButtons);
xs += 135;
if (xs >= 537)
{
xs = 35;
clefts += 80;
}
(这是数据库)
问题是如果我将[i]替换为[0]。它将仅显示数据库中的第一个值项目
(如果我将[i]替换为[0],则为GUI)单击任何按钮将重复相同的输出
请任何帮助将不胜感激。我正在尝试使用生成的新按钮显示来自MySQL的项目,这些按钮将显示在datagridview上。谢谢
最佳答案
尝试将i的值存储在委托示例内的局部变量中:
myButtons.Click += delegate
{
…
int local_i = i;
itemDetail = itemsWS.getItemInfo(itemLis[local_i].ToString());
…
}
实际执行委托时,i的值可能超出范围。
更新:
没有看到应用程序中的所有其他代码,很难确定,但是可能是委托执行时itemLis不再包含该索引处的项目。
尝试使用foreach循环,这样,在执行委托时,您将不会从itemLis数组中检索项目。
foreach (var item in itemLis)
{
itemDetails = itemsWS.getItemInfo(item);
....
myButtons.Click += delegate
{
...
itemDetail = itemsWS.getItemInfo(item);
...
}
...
}