質問編集履歴
4
画像の追加
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@@ -103,6 +103,7 @@
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```
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106
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+
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106
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###該当のソースコード
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107
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```C#
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/// <summary>
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画像の追加
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(... as System.Collections.Generic.List<KMAP.AirPortDataClass>) が null を返しました。
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```
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105
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+
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###該当のソースコード
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```C#
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/// <summary>
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2
画像の追加
title
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File without changes
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body
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@@ -101,7 +101,7 @@
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102
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(... as System.Collections.Generic.List<KMAP.AirPortDataClass>) が null を返しました。
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```
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104
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-
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104
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+
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105
105
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###該当のソースコード
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106
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```C#
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/// <summary>
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1
動画に書かれているコードを追加しました。
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@@ -10,7 +10,90 @@
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10
10
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11
11
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###参考にしたもの
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12
12
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[C# Tutorial - Read & Write csv file | FoxLearn](https://www.youtube.com/watch?v=96kHaIUMTEk)
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13
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+
写経元は以下のようになっています。
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14
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+
Studentクラスはデータグリッドビューのデータソースの選択から指定しています。
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15
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+
```
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16
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+
using CsvHelper;
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17
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+
using System;
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18
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+
using System.Collections.Generic;
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19
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+
using System.ComponentModel;
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20
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using System.Data;
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21
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+
using System.Drawing;
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22
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+
using System.IO;
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23
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+
using System.Linq;
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24
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+
using System.Text;
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25
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+
using System.Threading.Tasks;
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26
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+
using System.Windows.Forms;
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13
27
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28
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+
namespace ReadWriteCSV
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29
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+
{
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30
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+
public partial class Form1 : Form
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31
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+
{
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32
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+
public Form1()
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33
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+
{
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34
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+
InitializeComponent();
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35
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+
}
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36
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+
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37
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+
private void btnWrite_Click(object sender, EventArgs e)
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38
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+
{
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39
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+
using (SaveFileDialog sfd = new SaveFileDialog() { Filter = "CSV|*.csv", ValidateNames = true })
|
|
40
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+
{
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41
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+
if (sfd.ShowDialog()==DialogResult.OK)
|
|
42
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+
{
|
|
43
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+
using (var sw = new StreamWriter(sfd.FileName))
|
|
44
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+
{
|
|
45
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+
var writer = new CsvWriter(sw);
|
|
46
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+
writer.WriteHeader(typeof(Student));
|
|
47
|
+
foreach(Student s in studentBindingSource.DataSource as List<Student>)
|
|
48
|
+
{
|
|
49
|
+
writer.WriteRecord(s);
|
|
50
|
+
}
|
|
51
|
+
}
|
|
52
|
+
MessageBox.Show("Your data has been successfully saved.", "Message", MessageBoxButtons.OK, MessageBoxIcon.Information);
|
|
53
|
+
}
|
|
54
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+
}
|
|
55
|
+
}
|
|
56
|
+
|
|
57
|
+
private void Form1_Load(object sender, EventArgs e)
|
|
58
|
+
{
|
|
59
|
+
studentBindingSource.DataSource = new List<Student>();
|
|
60
|
+
}
|
|
61
|
+
|
|
62
|
+
private void btnRead_Click(object sender, EventArgs e)
|
|
63
|
+
{
|
|
64
|
+
using (OpenFileDialog ofd = new OpenFileDialog() { Filter = "CSV|*.csv", ValidateNames = true })
|
|
65
|
+
{
|
|
66
|
+
if (ofd.ShowDialog()==DialogResult.OK)
|
|
67
|
+
{
|
|
68
|
+
var sr = new StreamReader(new FileStream(ofd.FileName, FileMode.Open));
|
|
69
|
+
var csv = new CsvReader(sr);
|
|
70
|
+
//studentBindingSource.DataSource = csv.GetRecord<Student>().ToString();
|
|
71
|
+
studentBindingSource.DataSource = csv.GetRecords<Student>();
|
|
72
|
+
}
|
|
73
|
+
}
|
|
74
|
+
}
|
|
75
|
+
}
|
|
76
|
+
}
|
|
77
|
+
```
|
|
78
|
+
```
|
|
79
|
+
using System;
|
|
80
|
+
using System.Collections.Generic;
|
|
81
|
+
using System.Linq;
|
|
82
|
+
using System.Text;
|
|
83
|
+
using System.Threading.Tasks;
|
|
84
|
+
|
|
85
|
+
namespace ReadWriteCSV
|
|
86
|
+
{
|
|
87
|
+
public class Student
|
|
88
|
+
{
|
|
89
|
+
public string StudentID { get; set; }
|
|
90
|
+
public string StudentName { get; set; }
|
|
91
|
+
public string Email { get; set; }
|
|
92
|
+
public string Phone { get; set; }
|
|
93
|
+
}
|
|
94
|
+
}
|
|
95
|
+
|
|
96
|
+
```
|
|
14
97
|
###発生している問題・エラーメッセージ
|
|
15
98
|
foreachの行で発生。
|
|
16
99
|
```
|