我正在制作一个程序来检查我在大学里留下的课程数量。
我将信息从csv
加载到数据集中,然后用数据网格显示。
我想要一些列(实验室和理论)有复选框单元格,以便我可以检查我通过的课程,然后将它们保存回csv
以便稍后再次加载它们(当我通过somethnig:P时) 。
但是我将这些(字符串)列转换为复选框时遇到问题,因为我在c#
这是我的代码:
string delimiter = ";";
string tablename = "paTable";
filename = "aname";
DataSet dataset = new DataSet();
StreamReader sr = new StreamReader(filename);
DataGridViewColumn column = new DataGridViewColumn();
dataset.Tables.Add(tablename);
dataset.Tables[tablename].Columns.Add("A/A");
dataset.Tables[tablename].Columns.Add("Course");
dataset.Tables[tablename].Columns.Add("Semester");
dataset.Tables[tablename].Columns.Add("Theory");
dataset.Tables[tablename].Columns.Add("Lab");
dataset.Tables[tablename].Columns.Add("Passed");
string alldata = sr.ReadLine();
while (sr.Peek() != -1)
{
alldata = sr.ReadLine();
string[] rows;
rows = alldata.Split("\r".ToCharArray());
foreach (string r in rows)
{
string[] items = r.Split(delimiter.ToCharArray());
dataset.Tables[tablename].Rows.Add(items);
}
this.dataGridView1.DataSource = dataset.Tables[0].DefaultView;
}
任何帮助将不胜感激!
答案 0 :(得分:1)
您可以将文本框“转换”为如下所示的复选框:
dgv.Columns.RemoveAt(<NumberColumn2Remove>);
DataGridViewCheckBoxColumn chk = new DataGridViewCheckBoxColumn;
chk.HeaderText = "<HeaderText>";
chk.Name = "<WhatEver>";
chk.DataPropertyName = "<DataField2Bind2>";
dgv.Columns.Insert(<NumberColumn2Insert>, chk);
答案 1 :(得分:0)
您需要一个DataGridViewCheckBoxColumn:
所以你需要更换
DataGridViewColumn column = new DataGridViewColumn();
使用DataGridViewCheckBoxColumn。请阅读以下内容:
http://msdn.microsoft.com/en-us/library/system.windows.forms.datagridviewcheckboxcolumn.aspx
答案 2 :(得分:0)
如果您手动创建列并将其添加到DataGridView
,我认为您可以按原样保留DataSet
- 加载流程。
关闭AutoGenerateColumns
并手动添加:
dataGridView1.AutoGenerateColumns = false;
dataGridView1.Columns.Add(new DataGridViewTextBoxColumn { Name="Course", ... } );
dataGridView1.Columns.Add(new DataGridViewCheckBoxColumn { Name="Passed", ... } );
...
网格视图应在您与DataView
绑定之后填充:
dataGridView1.DataSource = dataset.Tables[0].DefaultView;
修改强>
因为它依赖于强类型和适当的绑定,所以可能更好的选择是创建一个表示CSV记录的类(假定的类型)。如果此类实现INotifyPropertyChanged
接口,则可以在DataGridView
中编辑值,并以最小的努力反映在类中。
public class CsvDataRow : INotifyPropertyChanged
{
private bool _aa;
private string _course;
private int _semester;
private double _theory;
private double _lab;
private bool _passed;
public bool AA { get { return _aa; } set { if (value == _aa) return; _aa = value; NotifyPropertyChanged("AA"); } }
public string Course { get { return _course; } set { if (value == _course) return; _course = value; NotifyPropertyChanged("Course"); } }
public int Semester { get { return _semester; } set { if (value == _semester) return; _semester = value; NotifyPropertyChanged("Semester"); } }
public double Theory { get { return _theory; } set { if (value == _theory) return; _theory = value; NotifyPropertyChanged("Theory"); } }
public double Lab { get { return _lab; } set { if (value == _lab) return; _lab = value; NotifyPropertyChanged("Lab"); } }
public bool Passed { get { return _passed; } set { if (value == _passed) return; _passed = value; NotifyPropertyChanged("Passed"); } }
char _delimiter;
// static factory method creates object from CSV row
public static CsvDataRow Create(string row, char delimiter)
{
return new CsvDataRow(row, delimiter);
}
// private constructor initializes property values
private CsvDataRow(string row, char delimiter)
{
_delimiter = delimiter;
var values = row.Split(_delimiter);
AA = (values[0].ToString().Equals("1"));
Course = Convert.ToString(values[1]);
Semester = Convert.ToInt32(values[2]);
Theory = Convert.ToDouble(values[3]);
Lab = Convert.ToDouble(values[4]);
Passed = (values[5].ToString().Equals("1"));
}
// a method to convert back into a CSV row
public string ToCsvString()
{
var values = new string[] { (AA ? 1 : 0).ToString(), Course, Semester.ToString(), Theory.ToString(), Lab.ToString(), (Passed ? 1: 0).ToString() };
return string.Join(_delimiter.ToString(), values);
}
// INotifyPropertyChanged interface requires this event
public event PropertyChangedEventHandler PropertyChanged;
// helper method to raise PropertyChanged event
private void NotifyPropertyChanged(string name)
{
if (PropertyChanged != null) PropertyChanged(this, new PropertyChangedEventArgs(name));
}
}
CSV文件本身可以用类表示:
public class CsvDataSource
{
public char Delimiter { get; private set; }
public CsvDataSource()
: this(',')
{ }
public string[] Columns { get; private set; }
public ObservableCollection<CsvDataRow> Rows { get; private set; }
public CsvDataSource(char delimiter)
{
Delimiter = delimiter;
}
public void LoadCsv(string csvFileName)
{
string header;
string data;
using (var reader = new StreamReader(csvFileName))
{
header = reader.ReadLine(); // assumes 1st row is column headers
data = reader.ReadToEnd();
}
Columns = header.Split(Delimiter);
var rows = Regex.Split(data, Environment.NewLine);
if (!rows.Select(row => row.Split(Delimiter)).All(row => row.Length == Columns.Length)) throw new FormatException("Inconsistent data format.");
Rows = new ObservableCollection<CsvDataRow>(rows.Select(row => CsvDataRow.Create(row, Delimiter)));
}
}
然后可以将DataGridView绑定到Rows
实例的CsvDataSource
属性,因此表单的代码可能如下所示:
public partial class Form1 : Form
{
private CsvDataSource _data;
private ObservableCollection<CsvDataRow> _rows;
public Form1()
{
InitializeComponent();
}
public void LoadCsv(CsvDataSource data)
{
_data = data;
_rows = _data.Rows;
dataGridView1.DataSource = _rows;
}
public void SaveCsv(string path)
{
using (var writer = new StreamWriter(path))
{
writer.WriteLine(string.Join(_data.Delimiter.ToString(), _data.Columns));
foreach (var row in _rows)
{
writer.WriteLine(row.ToCsvString());
}
}
}
}
当然你有一个调用SaveCsv
方法的按钮,你需要另一个按钮来向/从你的DataGridView添加/删除行。您还需要在try / cath块中包装文件I / O操作。
这是一个快速总结的实现,需要一些额外的工作才能完全正常运行,但它提供了一个想法,并且开箱即用。
这样,CsvDataRow
类完全处理了“定义列”部分,为每条记录提供了强类型。没有DataSet
,没有DataColumn
,也没有DataGridViewColumn
。只是数据和一些数据绑定。