如何根據if條件設置datagridview單元格的顏色

Question

我有一個datagridview，其中有許多列和許多行的數據，我想將一些單元格的顏色設置為紅色或綠色，以便在下面的代碼中使用
正如我的代碼所示，“考試”列未讀且未進入if condition.please建議我該怎么辦。

dataGridView2_RowPrePaint(object sender, DataGridViewRowPrePaintEventArgs e)//I have used this event

string unit = Convert.ToString(dataGridView2.Columns["exam"]);//One of my datagridview 
//column name is exam and in that column cells will be unit1 or unit2 or unit3 or unit 4 or quarterly or halfyearly or yearly
             if (unit == "Unit1"  || unit == "Unit2" || unit == "Unit3" || unit == "Unit4")
              {
                  for (int i = 0; i < dataGridView2.Rows.Count; i++)
                  {

                      for (int j = 7; j < dataGridView2.Rows[i].Cells.Count; j++)
                      {
                          if (Convert.ToInt32(dataGridView2.Rows[i].Cells[j].Value) < 13)
                          {
                              dataGridView2.Rows[i].Cells[j].Style.ForeColor = Color.Red;
                          }


                          else 
                          { 
                              dataGridView2.Rows[i].Cells[j].Style.ForeColor = Color.Green;
                          }
                      }
                  }

              }
              else
              {
                  for (int i = 0; i < dataGridView2.Rows.Count; i++)
                  {

                      for (int j = 7; j < dataGridView2.Rows[i].Cells.Count; j++)
                      {

                          if (Convert.ToInt32(dataGridView2.Rows[i].Cells[j].Value) < 35 )
                             dataGridView2.Rows[i].Cells[j].Style.ForeColor = Color.Red;
                         else
                              dataGridView2.Rows[i].Cells[j].Style.ForeColor = Color.Green;
                      }
                  }
              }

Answer 1

而不是使用==表示法，而是使用.Equals()來檢查它們是否相等。

if (unit.Equals("Unit 1") ||unit.Equals("Unit1") || unit.Equals("Unit2") || unit.Equals("Unit3") || unit.Equals("Unit4"))
    {
        //your logic
    }

應用以上邏輯，並同時使用

string data = (string)MyDataGridView[Colnum, Rownum].Value;

然后，您可以簡單地循環行和列

干杯! 希望能幫助到你。

Answer 2

這是我想要的代碼。
希望對別人有幫助。

 private void dataGridView3_RowPrePaint(object sender, DataGridViewRowPrePaintEventArgs e)
    {
        for (int i = 0; i < dataGridView3.Rows.Count; i++)
        {
            string unit = Convert.ToString(dataGridView3.Rows[i].Cells[6].Value);
            if (unit == "Unit1" || unit == "Unit2" || unit == "Unit3" || unit == "Unit4")
            {
                for (int k = 7; k < dataGridView3.Rows[i].Cells.Count; k++)
                {
                    int val = Convert.ToInt32(dataGridView3.Rows[i].Cells[k].Value);
                    if (val <= 12)
                    {
                        dataGridView3.Rows[i].Cells[k].Style.ForeColor = Color.Red;
                    }

                    else
                    {
                        dataGridView3.Rows[i].Cells[k].Style.ForeColor = Color.Green;
                    }

                }
            }

            else
            {
                for (int j = 7; j < dataGridView3.Rows[i].Cells.Count; j++)
                {
                    if (Convert.ToInt32(dataGridView3.Rows[i].Cells[j].Value) < 35)
                    {
                        dataGridView3.Rows[i].Cells[j].Style.ForeColor = Color.Red;
                    }
                    else
                        dataGridView3.Rows[i].Cells[j].Style.ForeColor = Color.Green;
                }
            }
        } 
    }