データグリッドビューから最大値を計算しようとしています。ここに私のコード全体があります：
namespace WindowsFormsApplication2
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
public class HRData
{
public int? HeartRate
{
get;
set;
}
public int? Speed
{
get;
set;
}
public int? Power
{
get;
set;
}
public int? Altitude
{
get;
set;
}
public override string ToString()
{
return String.Format("Heart rate={0}, Speed={1}, Power={2}, Altitude={3}", HeartRate, Speed, Power, Altitude);
}
}
public static class HRDataReader
{
static private int? ConvertValue(string[] values, int index)
{
if (index >= values.Length)
return null;
int value;
if (int.TryParse(values[index], out value))
return value;
return null;
}
static public IList<HRData> Read(string fileName)
{
if (string.IsNullOrEmpty(fileName))
throw new ArgumentNullException("fileName");
using (StreamReader sr = new StreamReader(fileName))
{
string line;
// First: Skip to the correct section.
while ((line = sr.ReadLine()) != null)
if (line == "[HRData]")
break;
// Now: Read the HRData
List<HRData> data = new List<HRData>();
while ((line = sr.ReadLine()) != null)
{
if (line.StartsWith("[") && line.EndsWith("]"))
break;
line = line.Trim().Replace("\t", " "); // Remove all tabs.
while (line.Contains(" ")) // Remove all duplicate spaces.
line = line.Replace(" ", " ");
string[] values = line.Split(' '); // Split the line up.
data.Add(new HRData
{
HeartRate = ConvertValue(values, 0),
Speed = ConvertValue(values, 1),
Power = ConvertValue(values, 2),
Altitude = ConvertValue(values, 3)
});
}
return data;
}
}
}
private void Form1_Load(object sender, EventArgs e)
{
}
private void button1_Click_1(object sender, EventArgs e)
{
if (openFileDialog1.ShowDialog() == DialogResult.OK)
{
dataGridView1.Rows.Clear();
dataGridView1.Columns.Clear();
IList<HRData> data = HRDataReader.Read(openFileDialog1.FileName);
dataGridView1.Columns.Add(new DataGridViewTextBoxColumn { Name = "HeartRate", HeaderText = "Heart rate", DataPropertyName = "HeartRate" });
dataGridView1.Columns.Add(new DataGridViewTextBoxColumn { Name = "Speed", HeaderText = "Speed", DataPropertyName = "Speed" });
dataGridView1.Columns.Add(new DataGridViewTextBoxColumn { Name = "Power", HeaderText = "Power", DataPropertyName = "Power" });
dataGridView1.Columns.Add(new DataGridViewTextBoxColumn { Name = "Altitude", HeaderText = "Altitude", DataPropertyName = "Altitude" });
dataGridView1.DataSource = data;
int maxSpeed = Speed.Max();
maxSpeed = maxSpeed / 10;
string MaxSpeed = Convert.ToString(maxSpeed);
textBox1.Text = MaxSpeed;
}
}
}
}
「int maxSpeed = Speed.Max();」でエラーが発生します。
エラー メッセージには、「名前 'Speed' は現在のコンテキストには存在しません」と表示されます。
列の 1 つを表すために、そこにどの値を入力すればよいかわかりません。誰かがこの問題で私を助けてくれることを願っています。ありがとうございました。