我正在使用分号分隔的文本文件填充 DataGridView，如下所示:
private void ExistingAppntmntRecs_Load(object sender, EventArgs e)
{
DataTable dt = SeparatedValsFileToDataTable(APPOINTMENTS_FILE_NAME, ";");
dataGridViewExistingAppntmntRecs.DataSource = dt;
}
// from http://stackoverflow.com/questions/39434405/read-csv-to-datatable-and-fill-a-datagridview (Frank)
public static DataTable SeparatedValsFileToDataTable(string filename, string separatorChar)
{
var table = new DataTable("Filecsv");
using (var sr = new StreamReader(filename, Encoding.Default))
{
string line;
var i = 0;
while (sr.Peek() >= 0)
{
try
{
line = sr.ReadLine();
if (string.IsNullOrEmpty(line)) continue;
var values = line.Split(new[] { separatorChar }, StringSplitOptions.None);
var row = table.NewRow();
for (var colNum = 0; colNum < values.Length; colNum++)
{
var value = values[colNum];
if (i == 0)
{
table.Columns.Add(value, typeof(String));
}
else
{ row[table.Columns[colNum]] = value; }
}
if (i != 0) table.Rows.Add(row);
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
i++;
}
}
return table;
}
我现在要做的是将当前日期两个月内的 EndDate 值的行着色为黄色，一个月内的行着色为橙色，并将日期为过去(意味着它们已经失效)的行着色为红色。
有一个 PostPaint 事件可能有效，但我不知道如何检查该事件处理程序中的行内的单元格内容:
private void dataGridViewExistingAppntmntRecs_RowPostPaint(object sender, DataGridViewRowPostPaintEventArgs e)
{
// What now?
}
以下是读取的文件的内容(虚假/测试数据，前置标题行):
person;phone;email;org;addr1;addr2;city;st8;zip;visitNum;success;adSizeLoc;meetingLoc;meetingDate;meetingTime;adBeginMonth;adBeginYear;adEndMonth;adEndYear;Notes
B.B. King;2221113333;<a href="https://stackoverflow.com/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="8defefe6e4e3eacdefe1f8e8fea3eee2e0" rel="noreferrer noopener nofollow">[email protected]</a>;Virtuosos;1234 Wayback Lane;;Chicago;IL;98765;1;false;Full Page Inside Front Cover;Same as Org Address;4/5/2017 2:03:12 PM;9:00 am;May;2017;May;2018;Lucille was her name
Linda Ronstadt;55577889999;<a href="https://stackoverflow.com/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="42302a2d2c26232e2b2c3136232636022723252e27366c212d2f" rel="noreferrer noopener nofollow">[email protected]</a>;Eagles Singer;La Canada;;Los Angeles;CA;99988;1;false;Full page Inside Back Cover;Same as Org Address;4/5/2017 2:05:23 PM;9:00 am;May;2017;May;2018;She had some good stuff
如果 adEndMonth + adEndYear 日期等于或小于 2 个月，则整行应为黄色；如果距离 1 个月或更短时间，则为橙色；如果今天或过去，把它涂成红色。最后，如果其中一位滚石乐队正在运行该应用程序，请将其漆成黑色。
这是 PostPaint 事件的一些伪代码，其中包含“TODO:”，我不知道该怎么做:
private void dataGridViewExistingAppntmntRecs_RowPostPaint(object sender, DataGridViewRowPostPaintEventArgs e)
{
DateTime twoMonthsLimit = DateTime.Now.AddMonths(2);
DateTime oneMonthLimit = DateTime.Now.AddMonths(1);
int endYear = // TODO: assign adEndYear value
int endMonth = // TODO: assign adEndMonth value
DateTime endDate = new DateTime(endYear, endMonth, 1);
if (twoMonthsLimit > endDate) // TODO: paint row yellow
if (oneMonthLimit > endDate) // TODO: paint row orange
if (endDate < DateTime.Now) // TODO: paint row red
}
最佳答案
如果目标太简单，突出显示特定日期内的行，然后更改行背景颜色可能是一个更简单的选择。重新绘制行可能是不必要的。我的解决方案只是根据“endMonth”和“endYear”列中的日期更改行背景颜色。
单元格格式是一个选项，但是它会经常触发，并且每次更改或显示单元格时都不需要进行此“着色”检查。如果行已经“着色”，那么唯一需要查找的是何时添加新行或“endMonth”或“endYear”列中的值发生更改。
下面的代码只是循环遍历 DataGridView 并根据您描述的条件设置每行颜色。获取行颜色的逻辑相当简单(减去将其涂成黑色)。如果日期比今天的日期早两个月以上，则将背景颜色保留为白色。如果日期大于 1 个月但小于 2 个月，则将该行涂成黄色……等等。
我使用类似的方法来读取文本文件并创建数据表。希望这会有所帮助。
DataTable dt;
string filePath = @"D:\Test\Artist.txt";
char delimiter = ';';
public Form1() {
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e) {
dt = GetTableFromFile(filePath, delimiter);
dataGridViewExistingAppntmntRecs.DataSource = dt;
UpdateDataGridColors();
}
private DataTable GetTableFromFile(string filePath, char delimiter) {
List<string[]> allArtists = GetArtistList(filePath, delimiter);
DataTable dt = GetTableColumns(allArtists[0]);
int totalCols = dt.Columns.Count;
DataRow dr;
for (int i = 1; i < allArtists.Count; i++) {
string[] curArtist = allArtists[i];
dr = dt.NewRow();
for (int j = 0; j < totalCols; j++) {
dr[j] = curArtist[j].ToString();
}
dt.Rows.Add(dr);
}
return dt;
}
private List<string[]> GetArtistList(string inFilePath, char inDelimiter) {
string pathToFile = inFilePath;
char delimiter = inDelimiter;
List<string[]> listStringArrays = File.ReadAllLines(pathToFile).Select(x => x.Split(delimiter)).ToList();
return listStringArrays;
}
private DataTable GetTableColumns(string[] allHeaders) {
DataTable dt = new DataTable();
foreach (string curHeader in allHeaders) {
dt.Columns.Add(curHeader, typeof(string));
}
return dt;
}
private Color GetColorForRow(DataRowView dr) {
// paint it black ;-)
if (dr[0].ToString().Equals("Rolling Stones")) {
return Color.Black;
}
DateTime rowDate;
DateTime dateNow = DateTime.Now;
DateTime twoMonthsLimit = dateNow.AddMonths(2);
DateTime oneMonthLimit = dateNow.AddMonths(1);
if (dr != null) {
string rowStringMonth = dr[17].ToString();
string rowStringYear = dr[18].ToString();
string rowStringDate = "1/" + rowStringMonth + "/" + rowStringYear;
if (DateTime.TryParse(rowStringDate, out rowDate)) {
if (rowDate > twoMonthsLimit)
return Color.White;
if (rowDate > oneMonthLimit)
return Color.Yellow;
if (rowDate > dateNow)
return Color.Orange;
if (rowDate.Month == dateNow.Month && rowDate.Year == dateNow.Year)
return Color.Orange;
// this row date is less than todays month date
return Color.Red;
} // else date time parse unsuccessful - ignoring
}
// date is null
return Color.White;
}
private void UpdateDataGridColors() {
Color rowColor;
DataRowView dr;
foreach (DataGridViewRow dgvr in dataGridViewExistingAppntmntRecs.Rows) {
dr = dgvr.DataBoundItem as DataRowView;
if (dr != null) {
rowColor = GetColorForRow(dr);
dgvr.DefaultCellStyle.BackColor = rowColor;
if (rowColor == Color.Black)
dgvr.DefaultCellStyle.ForeColor = Color.White;
}
}
}
private void dataGridViewExistingAppntmntRecs_CellValueChanged(object sender, DataGridViewCellEventArgs e) {
if (e.ColumnIndex == 17 || e.ColumnIndex == 18) {
//MessageBox.Show("End Date Changed");
UpdateDataGridColors();
}
}
private void dataGridViewExistingAppntmntRecs_RowsAdded(object sender, DataGridViewRowsAddedEventArgs e) {
UpdateDataGridColors();
}
关于c# - 如何根据两个单元格中的值在 DataGridView 中绘制选定的行？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/43243118/