在网格视图中添加值之前，请检查值是否已存在 [英] Check if value already exists before adding values in grid view

问题描述

我想在4个Textbox中添加datagridview中的一些行（没有绑定）。但我需要先检查它是否已经添加，然后显示一条消息，如果尚未添加，则在gridview中添加Textbox的文本值。我正在使用VS 2008和C＃我搜索了很多所有可用的解决方案，但没有和我一起工作。



我试图在行上循环，但我无法工作。

I want to add some rows in datagridview (without binding) from 4 Textboxes. but I need first to check if it is already added, it yes then show a message, if not already added, then add the text value of the Textboxin the gridview. I am using VS 2008 with C# I search a lot of all available solutions but not working with me.

I tried to loop on the rows but I couldnt work.

foreach (DataGridViewRow row in dataGridView1.Rows)
                {
                    if ((string)row.Cells[0].Value == txtbx1.Text && ((string)row.Cells[1].Value == txtbx2.Text.ToString() && ((string)row.Cells[2].Value == txtbx3_new.Text.ToString() && ((string)row.Cells[3].Value == txtbx4.Text.ToString()))))
                    {
                        b_found = true;
                         MessageBox.Show("Test");
                         break;
                    }
                     
                }
                
                else
                {
                    dataGridView1.Rows.Add(new object[] { txtbx1.Text, txtbx2.Text, txtbx3.Text, txtbx4.Text, false });
                   
                }

推荐答案

private void button1_Click(object sender, EventArgs e)
        {
            bool entryFound = false;
            foreach (DataGridViewRow row in dataGridView1.Rows)
            {
                object val1 = row.Cells[0].Value;
                object val2 = row.Cells[1].Value;
                object val3 = row.Cells[2].Value;
                object val4 = row.Cells[3].Value;
                if (val1 != null && val1.ToString() == textBox1.Text &&
                    val2 != null && val2.ToString() == textBox2.Text &&
                    val3 != null && val3.ToString() == textBox3.Text &&
                    val4 != null && val4.ToString() == textBox4.Text)
                {
                    MessageBox.Show("Entry already exist");
                    entryFound = true;
                    break;
                }
            }

            if (!entryFound)
            {
                dataGridView1.Rows.Add(textBox1.Text, textBox2.Text, textBox3.Text, textBox4.Text);
            }

        }

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