C# DataView Date Range with LIKE Operator?
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19-09-2019 - |
Question
I have an XML file:
<SMS>
<Number>+447761692278</Number>
<DateTime>2009-07-27T15:20:32</DateTime>
<Message>Yes</Message>
<FollowedUpBy>Unassigned</FollowedUpBy>
<Outcome></Outcome>
<Quantity>0</Quantity>
<Points>0</Points>
</SMS>
<SMS>
<Number>+447706583066</Number>
<DateTime>2009-07-27T15:19:16</DateTime>
<Message>STOP</Message>
<FollowedUpBy>Unassigned</FollowedUpBy>
<Outcome></Outcome>
<Quantity>0</Quantity>
<Points>0</Points>
</SMS>
I use an XMLReader to read the file into a dataset and display it in a datagridview. I want to be able to specify a range of dates to display the data for. For example where the element contains a date between INSERT DATE & INSERT DATE. In order to do this I am using a DATAVIEW and then populating the datagridview with the dataview instead of the dataset.
Currently I have a method as below:
public void DisplayRecSmsByDateRange(string date1,string date2, string readDir)
{
DataSet ds = new DataSet("SMS DataSet");
XmlDataDocument xmlDatadoc = new XmlDataDocument();
xmlDatadoc.DataSet.ReadXml(readDir);
ds = xmlDatadoc.DataSet;
DataView custDV = new DataView(ds.Tables["SMS"]);
custDV.RowFilter = String.Format("(DateTime >= DateTime LIKE '{0}*' AND DateTime <= DateTime LIKE '{1}*')", EscapeLikeValue(date1), EscapeLikeValue(date2));
this.dataGridView1.DataSource = custDV;
}
The problem is that if you look at the xml file, the element contains the time as well as the date. Since I am not interested in the time part of this element, I would use the "LIKE" statement to display the data from the xml file based on just the date part of the element. As a result of this, when i try and perform a boolean operation to say for example - "Show me the data for dates between 2009-07-27 and 2009-07-30", I get an error since the compiler does not like that I am trying to combine the LIKE operator with the boolean <=,>= operators (Shown in the above method). Is there a way around this? I need to be able to display data between a range of dates but use the LIKE operator to search based only the first part of the element.
Help appreciated greatly,
Kind regards.
Solution 4
A slight alteration to the method, removing the LIKE operator worked......
public void DisplayRecSmsByDateRange(string date1,string date2, string readDir)
{
DataSet ds = new DataSet("SMS DataSet");
XmlDataDocument xmlDatadoc = new XmlDataDocument();
xmlDatadoc.DataSet.ReadXml(readDir);
ds = xmlDatadoc.DataSet;
DataView custDV = new DataView(ds.Tables["SMS"]);
custDV.RowFilter = String.Format("(DateTime >= '{0}*' and DateTime <= '{1}*')", EscapeLikeValue(date1), EscapeLikeValue(date2));
custDV.Sort = "DateTime";
this.dataGridView1.DataSource = custDV;
}
OTHER TIPS
I'll assume that you can modify/replace the EscapeLikeValue() method so that it returns only date part, e.g. "2009-09-27". This way you can rewrite the filter to something like:
custDV.RowFilter = String.Format("(DateTime >= '{0}' AND DateTime <='{1}')", EscapeLikeValue(date1) + "T00:00:00", EscapeLikeValue(date2) + "T23:59:59");
HTH, Dejan
I wonder if you can do the following:
custDV.RowFilter = String.Format("(Convert(DateTime,'System.DateTime' >= #{0}# AND Convert(DateTime,'System.DateTime' <= #{1}#)", EscapeLikeValue(date1), EscapeLikeValue(date2));
One way you can do this is to convert the date string parameters into actual datetime objects like so
DateTime dt = System.Convert.ToDateTime(date1);
DateTime dt2 = System.Convert.ToDateTime(date2);
dt2=dt2.AddDays(1);
and then you can modify your where like so
custDV.RowFilter=String.Format("DateTime>={0} and DateTime<{1}",dt.ToShortDateString(),dt2.ToShortDateString());