Compare a list of string values with data table

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1.00/5 (2 votes)

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Hi All,
I have a requirement to compare a text box input (Which would have a list of alphanumeric numbers separated by a delimiter) with a list of numbers in a dynamic datatable. The result on positive comparison is to show which ones among the list of alphanumeric numbers are in the datatable in an alert pop-up box.
And show a different alert if none of the containers in the list match the criteria.

I am currently able to achieve this for one input string. I just need sample code to split the string, store in an array and compare it with datatable. Thanks.

C#

public void Search_click(Object sender, EventArgs E)
    {
        string path = @"C:\TEMP\SearchString.xlsx";
        string connStr = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + path + ";Extended Properties=Excel 12.0;";
        OleDbConnection objConn = new OleDbConnection(connStr);
        try
        {
            objConn.Open();
            OleDbCommand objCmdSelect = new OleDbCommand("SELECT * FROM MyRange", objConn);
            OleDbDataAdapter objAdapter1 = new OleDbDataAdapter();
            objAdapter1.SelectCommand = objCmdSelect;
            DataSet objDataset1 = new DataSet();
            objAdapter1.Fill(objDataset1, "XLData");
            string strExcelInfo = "";
            strInfoText = _hiddentextInfo.Value;
            bool foundinExcel = false;

            if (objDataset1.Tables[0].Rows.Count > 0)
            {
                for (int i = 0; i < objDataset1.Tables[0].Rows.Count; i++)
                {
                    strExcelInfo = Convert.ToString(objDataset1.Tables[0].Rows[i]["Sheet1"].ToString());

                    if (strInfoText.Contains(strExcelInfo))
                    {
                        foundinExcel = true;
                        break;
                    }
                    else
                    {
                        continue;
                    }
                }
            }
            if (foundinExcel == true)
            {
                ClientScript.RegisterClientScriptBlock(this.GetType(), "alert", "alert('" + strInfoText + " is in the excel file')", true);

            }

            else if (foundinExcel == false)
            {
                ClientScript.RegisterClientScriptBlock(this.GetType(), "alert", "alert('" + strInfoText + " is not in the excel file.')", true);

            }
        }

Posted 19-Jan-16 7:57am

Rajesh_1980

Updated 19-Jan-16 10:40am

v3

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Comments

Maciej Los 19-Jan-16 15:44pm

What have you tried? Where are you stuck?

1 solution

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Maciej Los · Accepted Answer · 2016-01-19T10:03:00

One of the simplest way is to use Linq to DataSet[^].

C#

void Main()
{
	string myDelimitedText = "A123,C521,A224,B221,";
	DataTable dt = CreateDataTable();
	
	var dl = myDelimitedText.Split(new char[]{','}, StringSplitOptions.RemoveEmptyEntries)
			.Select(x=>new
				{
					Alpha = x,
					IsInDt = dt.AsEnumerable().Any(y=>y.Field<string>("MyField")==x)
				});
	foreach (var a in dl)
	{
		Console.WriteLine("{0} {1}", a.Alpha, a.IsInDt);
	}

	
}

// Define other methods and classes here
public static DataTable CreateDataTable()
{
	DataTable dt = new DataTable();
	dt.Columns.Add(new DataColumn("MyField", Type.GetType("System.String")));

	dt.Rows.Add(new Object[]{"A123"});
	dt.Rows.Add(new Object[]{"B123"});
	dt.Rows.Add(new Object[]{"C123"});
	dt.Rows.Add(new Object[]{"A224"});
	dt.Rows.Add(new Object[]{"C324"});
	
	return dt;

}

Result:

Alpha IsInDt
A123 True 
C521 False 
A224 True 
B221 False

For futher information, please see: Queries in LINQ to DataSet[^]