检查TextBox是否为空并返回MessageBox？
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我发出此语句来检查TextBox是否为空，但MessageBox始终显示
TextBox是否为空。
private void NextButton_Click(object sender, EventArgs e)
{
decimal MarkPoints, x, y;
x = HoursNumericUpDown.Value;
y = MarkNumericUpDown.Value;
MarkPoints = x * y;
//decimal MarkPoints = (decimal)HoursNumericUpDown.Value * (decimal)HoursNumericUpDown.Value;
DataGridViewRow dgvRow = new DataGridViewRow();
DataGridViewTextBoxCell dgvCell = new DataGridViewTextBoxCell();
dgvCell = new DataGridViewTextBoxCell();
dgvCell.Value = MaterialTextBox.Text;
dgvRow.Cells.Add(dgvCell);
dgvCell = new DataGridViewTextBoxCell();
dgvCell.Value = HoursNumericUpDown.Value;
dgvRow.Cells.Add(dgvCell);
dgvCell = new DataGridViewTextBoxCell();
dgvCell.Value = MarkNumericUpDown.Value;
dgvRow.Cells.Add(dgvCell);
dgvCell = new DataGridViewTextBoxCell();
dgvCell.Value = MarkPoints;
dgvRow.Cells.Add(dgvCell);
dataGridView1.Rows.Add(dgvRow);
MaterialTextBox.Clear();
HoursNumericUpDown.Value = HoursNumericUpDown.Minimum;
MarkNumericUpDown.Value = MarkNumericUpDown.Minimum;
if (String.IsNullOrEmpty(MaterialTextBox.Text))
{
MessageBox.Show(\"Enter Material Name Please.\", \"Error\", MessageBoxButtons.OK, MessageBoxIcon.Warning);
//dataGridView1.Rows.Clear();
}
else
{
/*if (MarkNumericUpDown.Value < 50)
{
int index = dataGridView1.Rows.Add();
dataGridView1.Rows[1].Cells[4].Value = \"F\";
}
else if (MarkNumericUpDown.Value > 50 && MarkNumericUpDown.Value <= 64)
{
dataGridView1.Rows[index].Cells[4].Value = \"F\";
}*/
没有找到相关结果
已邀请:
6 个回复
仿普
if (string.IsNullOrWhiteSpace(MaterialTextBox.Text)) { // Message box }抚驰
/* !! This clears the textbox BEFORE you check if it\'s empty */ MaterialTextBox.Clear(); HoursNumericUpDown.Value = HoursNumericUpDown.Minimum; MarkNumericUpDown.Value = MarkNumericUpDown.Minimum; if (String.IsNullOrEmpty(MaterialTextBox.Text)) { MessageBox.Show(\"Enter Material Name Please.\", \"Error\", MessageBoxButtons.OK, MessageBoxIcon.Warning); //dataGridView1.Rows.Clear(); }氏脑
浅镁
if (String.IsNullOrEmpty(MaterialTextBox.Text) || String.IsNullOrWhiteSpace(MaterialTextBox.Text)) { //do job } else { MessageBox.Show(\"Please enter correct path\"); }广躺椽
...绵扇寸访
if (MaterialTextBox.Text.length==0) { message }