C# 如何根据两个单元格中的值在DataGridView中绘制选定行?
我使用分号分隔的文本文件填充DataGridView,如下所示:C# 如何根据两个单元格中的值在DataGridView中绘制选定行?,c#,winforms,datagridview,datagridviewcolumn,paintevent,C#,Winforms,Datagridview,Datagridviewcolumn,Paintevent,我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:
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;
}
以下是读取的文件内容(虚假/测试数据,带有标题行):
如果adEndMonth+adEndYear日期等于2个月或更短时间,则整行应为黄色;如果1个月或更短,橙色;如果是今天还是过去,把它涂成红色。最后,如果某个滚石乐队正在运行该应用程序,请将其涂成黑色
以下是一些用于延迟事件的伪代码,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
}
private void dataGridViewExistingAppntmntRecs_RowPostPaint(对象发送方,DataGridViewRowPostPaintEventArgs e)
{
DateTime twoMonthsLimit=DateTime.Now.AddMonths(2);
DateTime one monthlimit=DateTime.Now.AddMonths(1);
int endYear=//TODO:分配adEndYear值
int endMonth=//TODO:分配adEndMonth值
DateTime endDate=新的日期时间(endYear,endMonth,1);
如果(两个月限制>结束日期)//TODO:将行涂成黄色
if(oneMonthLimit>endDate)//TODO:将行绘制为橙色
if(endDate
如果目标过于简单,请突出显示特定日期内的行,然后更改行的背景色可能是一个更简单的选择。可能不需要重新绘制行。我的解决方案只是根据“endMonth”和“endYear”列中的日期更改行的背景颜色
单元格格式是一个选项,但是,它会经常触发,并且在每次更改或显示单元格时都进行此“着色”检查是不必要的。如果行已经“着色”,那么唯一需要查找的是添加新行或更改“endMonth”或“endYear”列中的值
下面的代码只是在DataGridView
中循环,并根据您描述的条件设置每一行的颜色。获取行颜色的逻辑相当简单(减去将其绘制为黑色)。如果日期比今天的日期提前两个月,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,则将行涂成黄色…等等
我使用类似的方法读取文本文件并创建数据表。希望这有帮助
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();
}
DataTable dt;
字符串文件路径=@“D:\Test\Artist.txt”;
字符分隔符=';';
公共表格1(){
初始化组件();
}
私有void Form1\u加载(对象发送方、事件参数e){
dt=GetTableFromFile(文件路径,分隔符);
dataGridViewExistingAppntmntRecs.DataSource=dt;
UpdateDagRidColors();
}
私有数据表GetTableFromFile(字符串文件路径,字符分隔符){
List allArtists=GetArtistList(文件路径,分隔符);
DataTable dt=GetTableColumns(allArtists[0]);
int totalCols=dt.Columns.Count;
数据行dr;
for(int i=1;ix.Split(分隔符)).ToList();
返回liststringarray;
}
私有DataTable GetTableColumns(字符串[]AllHeader){
DataTable dt=新的DataTable();
foreach(所有标头中的字符串curHeader){
添加(curHeader,typeof(string));
}
返回dt;
}
专用颜色GetColorForRow(DataRowView dr){
//把它涂成黑色;-)
if(dr[0].ToString().Equals(“滚石”)){
返回颜色。黑色;
}
日期时间行日期;
DateTime dateNow=DateTime.Now;
DateTime twoMonthsLimit=dateNow.AddMonths(2);
DateTime one monthlimit=dateNow.AddMonths(1);
如果(dr!=null){
字符串rowStringMonth=dr[17]。ToString();
字符串rowStringYear=dr[18]。ToString();
字符串rowStringDate=“1/”+rowStringMonth+“/”+rowStringYear;
if(DateTime.TryParse(rowStringDate,out rowDate)){
如果(行日期>两个月限制)
返回颜色。白色;
如果(行日期>一个月限制)
返回颜色。黄色;
如果(rowDate>dateNow)
返回颜色:橙色;
if(rowDate.Month==dateNow.Month&&rowDate.Year==dateNow.Year)
返回颜色:橙色;
//此行日期小于今天的月份日期
返回颜色:红色;
}//else日期时间分析失败-忽略
}
//日期为空
返回颜色。白色;
}
私有void updateDagDagRidColors(){
颜色行颜色;
数据行视图dr;
foreach(dataGridViewExistingAppntmntRecs.Rows中的DataGridViewRow dgvr){
dr=dgvr.DataBoundItem作为DataRowView;
如果(dr!=null){
rowColor=GetColorForRow(dr);
dgvr.DefaultCellStyle.BackColor=行颜色;
if(rowColor==Color.Black)
dgvr.DefaultCellStyle.ForeColor=颜色.白色;
}
}
}
私有void dataGridViewExistingAppntmntRecs\u CellValueChanged(对象发送方,DataGridViewCellEventArgs e){
如果(e.ColumnIndex==17 | | e.ColumnIndex==18){
//MessageBox.Show(“结束日期更改”);
UpdateDagRidColors();
}
}
私有void dataGridViewExistingAppntmntRecs_RowsAdded(对象发送方,DataGridViewRowsAddedEventArgs e){
UpdateDagRidColors();
}
您可以尝试使用CellFormatting
事件来执行此操作,也可以不使用绘制,只需更改整行背景色
。然后为或foreach
添加一个,无论您喜欢循环所有行。这可能很棘手的一点是,我必须检查两个单元格(月份和年份)的值,然后才能确定是否更改背景色,以及更改到什么程度……确实很棘手。我做了类似的事情,但比较了Double
而不是DateTime
。也许可以做一些类似于DateTime cellval的事情
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
}
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();
}