[英]How can i format a string as currency in a data bound DataGrid in WPF C#?
I have some data being shown in a DataGrid. 我有一些数据显示在DataGrid中。 The data comes from SQL, where a "money" type can be null.
数据来自SQL,其中“金钱”类型可以为null。 When i display this data, all is OK when i format the data in a double column format as currency.
当我显示此数据时,当我以双列格式将数据格式化为货币时,一切正常。 ie:
即:
internal void FillGrid() { 内部void FillGrid(){
bD = new DataTable();
DataTable dt = EmployerQuery(); //queries the SQL DB
bD.Columns.Add(new DataColumn("ID", typeof(int)));
bD.Columns.Add(new DataColumn("EmployerName", typeof(string)));
bD.Columns.Add(new DataColumn("FlatMinAmount", typeof(double)));
bD.Columns.Add(new DataColumn("DistrictRate", typeof(double)));
bD.Columns.Add(new DataColumn("VendorRate", typeof(double)));
bD.Columns.Add(new DataColumn("Description", typeof(string)));
bD.Columns.Add(new DataColumn("EmployeeCount", typeof(int)));
foreach (DataRow sqlRow in dt.Rows)
{
var row = bD.NewRow();
row["ID"] = sqlRow["ClientID"];
row["EmployerName"] = sqlRow["OfficialName"];
row["FlatMinAmount"] = sqlRow["FlatMinAmount"];
row["DistrictRate"] = sqlRow["DistrictRate"];
row["VendorRate"] = sqlRow["VendorRate"];
row["Description"] = sqlRow["Description"];
row["EmployeeCount"] = sqlRow["EmployeeCount"];
bD.Rows.Add(row);
}
However, I then save the data as a .csv file. 但是,然后将数据另存为.csv文件。 When i read that file back, the values for "FlatMinAmount" that were null are not allowed to be inserted into a column type double, so I cannot format the data columns as type double, since many are null.
当我读回该文件时,不允许将null的“ FlatMinAmount”值插入到double类型的列中,因此我无法将数据列格式化为double类型,因为许多字段为null。
<dg:DataGrid Name="newGrid" ItemsSource="{Binding ElementName=readGrid, Path=readGrid}" AutoGenerateColumns="False"
Margin="5" Height="175" Width="Auto" ColumnWidth="Auto">
<dg:DataGrid.Columns>
<dg:DataGridTextColumn Binding="{Binding ID}" Header="Employer ID" Width="Auto" IsReadOnly="True"/>
<dg:DataGridTextColumn Binding="{Binding EmployerName}" Header="Employer Name" Width="Auto" IsReadOnly="True"/>
<dg:DataGridTextColumn Binding="{Binding FlatMinAmount, StringFormat=C}" Header="FlatMinAmount" Width="Auto" IsReadOnly="True"/>
<dg:DataGridTextColumn Binding="{Binding DistrictRate, StringFormat=C}" Header="District Rate" Width="Auto" IsReadOnly="True"/>
<dg:DataGridTextColumn Binding="{Binding VendorRate, StringFormat=C}" Header="Vendor Rate" Width="Auto" IsReadOnly="True"/>
<dg:DataGridTextColumn Binding="{Binding Description}" Header="Description" Width="Auto" IsReadOnly="True"/>
<dg:DataGridTextColumn Binding="{Binding EmployeeCount}" Header="EmployeeCount" Width="*" IsReadOnly="True"/>
</dg:DataGrid.Columns>
</dg:DataGrid>
DataTable r = new DataTable();
try
{
//string csv = string.Empty;
//r.Columns.Add("ID", typeof(int));
//r.Columns.Add("EmployerName", typeof(string));
//r.Columns.Add("FlatMinAmount",typeof(double));
//r.Columns.Add("DistrictRate", typeof(double));
//r.Columns.Add("VendorRate", typeof(double));
//r.Columns.Add("Description", typeof(string));
//r.Columns.Add("EmployeeCount", typeof(int));
r.Columns.Add("ID");
r.Columns.Add("EmployerName");
r.Columns.Add("FlatMinAmount");
r.Columns.Add("DistrictRate");
r.Columns.Add("VendorRate");
r.Columns.Add("Description");
r.Columns.Add("EmployeeCount");
// Read sample data from CSV file
using (CsvFileReader reader = new CsvFileReader(filename))
{
CsvRow row = new CsvRow();
while (reader.ReadRow(row))
{
//foreach (string s in row)
{
r.Rows.Add(row[0], row[1], row[2], row[3], row[4], row[5], row[6]);
}
}
}
(readGrid is then set to r in code-behind) (然后在代码后面将readGrid设置为r)
If they are string, then i cannot use the StringFormat=C in the binding to show $ etc. Also, it seems I cannot style a DataGridTextColumn. 如果它们是字符串,那么我不能在绑定中使用StringFormat = C来显示$等。而且,看来我无法设置DataGridTextColumn的样式。 So, how can i display the values I read in from .csv as $xx.xx?
那么,如何显示从.csv读取的值作为$ xx.xx?
use Double.Parse()
- http://msdn.microsoft.com/en-us/library/system.double.parse.aspx to format the value when you read it in. This will allow you to use double and you can then apply the appropriate formatting for output. 使用
Double.Parse()
: //msdn.microsoft.com/zh-cn/library/system.double.parse.aspx读取值时格式化该值。这将允许您使用double并可以然后将适当的格式应用于输出。
Updated: The issue you seem to be having that when reading from file the value is null
and when reading from database it is DBNull
. 已更新:您似乎遇到的问题是,从文件读取时该值为
null
而从数据库读取时为DBNull
。 By default DataTable
allows for DBNull
values. 默认情况下,
DataTable
允许使用DBNull
值。 If you want to mimic this for read, try the following 如果您想模仿此内容以供阅读,请尝试以下操作
DataTable r = new DataTable();
try
{
r.Columns.Add("ID");
r.Columns.Add("EmployerName");
r.Columns.Add("FlatMinAmount");
r.Columns.Add("DistrictRate");
r.Columns.Add("VendorRate");
r.Columns.Add("Description");
r.Columns.Add("EmployeeCount");
// Read sample data from CSV file
using (CsvFileReader reader = new CsvFileReader(filename))
{
CsvRow row = new CsvRow();
while (reader.ReadRow(row))
{
//foreach (string s in row)
{
double d;
double? val2 = null;
double? val3 = null;
double? val4 = null;
if (Double.TryParse(row[2], out d)) val2 = d;
if (Double.TryParse(row[3], out d)) val3 = d;
if (Double.TryParse(row[4], out d)) val4 = d;
r.Rows.Add(row[0], row[1], val2, val3, val4, row[5], row[6]);
}
}
}
使用TargetNullValue
属性:
<dg:DataGridTextColumn Binding=""{Binding FlatMinAmount,TargetNullValue='Not Specified',StringFormat=C}" Header="FlatMinAmount" Width="Auto" IsReadOnly="True"/>
If you know the number is null, can't you just set the value of the column to DBNull? 如果您知道数字为空,就不能仅将列的值设置为DBNull吗?
row["FlatMinAmount"] = DBNull.Value;
Here's a little console app I ran to show this working: 这是我运行的一个小控制台应用程序,以显示其工作原理:
class Program { static void Main(string[] args) { DataTable tbl = new DataTable(); DataColumn col = new DataColumn("Blah", typeof(double)); tbl.Columns.Add(col); DataRow row = tbl.NewRow(); row["Blah"] = DBNull.Value; Console.WriteLine("Result: " + row["Blah"].ToString()); Console.ReadKey(); } }
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