我正在从 Yahoo 的“Stock API”更新我的单元格值。它的工作原理就像一个魅力，一切都在正确更新，但是当执行更新时，这几乎是所有时间，因为它们在一个间隔为 3000 毫秒的计时器中。我怎样才能摆脱这个问题？
我尝试暂停布局并恢复，但没有成功。
这是我自己的小自学项目，所以请记住，我以前从来没有用 xml 或 datagridview 做任何事情。
private void timer2_Tick(object sender, EventArgs e)
{
try
{
if (!(dataGridView.Rows[0].Cells[0].Value == null)) // Updates the rows idividualy as long as first row is not empty
{
for (int i = 0; i < dataGridView.RowCount; i++)
{
if (!(dataGridView.Rows[i].Cells[0].Value == null || dataGridView.Rows[i].Cells[0].Value.ToString() == "-")) // Makes sure that the row to update is not an empty row
{
String symbol;
symbol = Convert.ToString(dataGridView.Rows[i].Cells[0].Value);
String URLString2 = "http://query.yahooapis.com/v1/public/yql?q=select%20*%20from%20yahoo.finance.quotes%20where%20symbol%20in%20(%22" + symbol + "%22)%0A%09%09&diagnostics=true&env=http%3A%2F%2Fdatatables.org%2Falltables.env";
dataGridView.ResumeLayout();
dataGridView.Update();
for (int t = 2; t < dataGridView.Columns.Count; t++)
{
dataGridView.SuspendLayout();
XmlTextReader reader2 = new XmlTextReader(URLString2); // Makes the reader read from the string abow ( URL )
string NasdaqOpenTime = "09:00:00";
// if the market haven't been open for the day then theres no DaysLow value
if (dataGridView.Columns[t].HeaderText == "DaysLow" && DateTime.Now.CompareTo(DateTime.Parse(NasdaqOpenTime)) == -1)
{
dataGridView.Rows[i].Cells[dataGridView.Columns[t].Index].Value = "-";
}
// if the market haven't been open for the day then theres no DaysHigh value
if (dataGridView.Columns[t].HeaderText == "DaysHigh" && DateTime.Now.CompareTo(DateTime.Parse(NasdaqOpenTime)) == -1)
{
dataGridView.Rows[i].Cells[dataGridView.Columns[t].Index].Value = "-";
}
else
{
reader2.ReadToFollowing(dataGridView.Columns[t].HeaderText); // Reada until it fins the elemnt Bid , then stops on it
reader2.ReadStartElement(dataGridView.Columns[t].HeaderText); // Recognizes Bid as start element (Bid)
dataGridView.Rows[i].Cells[dataGridView.Columns[t].Index].Value = reader2.ReadString(); // Reads the text in between (Declared as a string) actualy the bid value
reader2.ReadEndElement(); // Checks that the current nod is an end element (/Bid) if so then continue
reader2.ResetState();
}
}
}
}
}
}
catch (XmlException)
{
}
}