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Convert strings in DataRow to double


Convert strings in DataRow to double

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Convert strings in DataRow to double
Tag : chash , By : Simon Hogg
Date : November 26 2020, 09:01 AM

this one helps. You need to specify the column type when you add the column. Change the code that creates the columns to something like this (based on which columns you want to have type double):
foreach (string header in headers.Take(3))
{
    dt.Columns.Add(header, typeof(double));
}

foreach (string header in headers.Skip(3))
{
    dt.Columns.Add(header, typeof(string));
}

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C# getting an error. Cannot implicity convert from System.Data.DataRow to DataRow


Tag : chash , By : MikeG
Date : March 29 2020, 07:55 AM
hope this fix your issue I am getting this error , Try with
var dRowList = target.SearchFor(searchPhrase, searchField, matchesAny);

Convert IEnumerable<DataRow> to EnumerableRowCollection<DataRow> or DataView


Tag : chash , By : Willem van Schevikho
Date : March 29 2020, 07:55 AM
it fixes the issue How i can result to EnumerableRowCollection or DataView? , As Jon Skeet said:
DataTable table1 = /*something*/ ;
DataTable table2 = /*something*/ ;
DataTable table3 = /*something*/ ;

DataTable result = (from t1 in table1.AsEnumerable() join 
                                    t2 in table2.AsEnumerable() on t1.Field<int>("id") equals t2.Field<int>("t1id") join
                                    t3 in table3.AsEnumerable() on t2.Field<int>("t3id") equals t3.Field<int>("id")
                               where 666.Equals(t3.Field<int>("id"))
                              select t1).CopyToDataTable<DataRow>();
DataTable table1 = /*something*/ ;
DataTable table2 = /*something*/ ;
DataTable table3 = /*something*/ ;

DataView result = (from t1 in table1.AsEnumerable() join 
                                    t2 in table2.AsEnumerable() on t1.Field<int>("id") equals t2.Field<int>("t1id") join
                                    t3 in table3.AsEnumerable() on t2.Field<int>("t3id") equals t3.Field<int>("id")
                               where 666.Equals(t3.Field<int>("id"))
                              select t1).CopyToDataTable<DataRow>().AsDataView();

convert from double to strings


Tag : string , By : todor
Date : March 29 2020, 07:55 AM
I wish this help you One way to do this is to use sprintf to convert the array to a long string of digits. You can then reshape this string into the appropriate shape. Then you can use cellstr to convert each row of the reshaped string into a separate cell array element.
out = cellstr(reshape(sprintf('%d', A), [], size(A,2)));
s = sprintf('%d', A)
%// 1234123411112222111111112222222211111111 
s = reshape(s, [], size(A,2))
%// 11121
%// 21121
%// 31121
%// 41121
%// 12121
%// 22121
%// 32121
%// 42121
out = cellstr(s);
%// '11121'
%// '21121'
%// '31121'
%// '41121'
%// '12121'
%// '22121'
%// '32121'
%// '42121'
%// Then convert each number to a string in a cell array
out = arrayfun(@num2str, A * (10.^(size(A, 2)-1:-1:0)).', 'uni', 0);
out = sprintfc('%d', A * (10.^(size(A, 2)-1:-1:0)).');
function tests()
    % Test the number of rows between 100 and 10000
    nRows = round(linspace(100, 10000, 100));

    times1 = zeros(numel(nRows), 1);
    times2 = zeros(numel(nRows), 1);
    times3 = zeros(numel(nRows), 1);
    times4 = zeros(numel(nRows), 1);
    times5 = zeros(numel(nRows), 1);

    %// Generate a random matrix of N x 5
    getRandom = @(n)randi([0, 9], [n, 5]);

    for k = 1:numel(nRows)
        A = getRandom(nRows(k));
        times1(k) = timeit(@()string_reshape_method(A));
        A = getRandom(nRows(k));
        times2(k) = timeit(@()base10_method(A));
        A = getRandom(nRows(k));
        times3(k) = timeit(@()sprintfc_method(A));
        A = getRandom(nRows(k));
        times4(k) = timeit(@()addition_method(A));
    end

    %// Plot the results
    plot(nRows, cat(2, times1, times2, times3, times4)*1000);
    legend({'String Reshape', 'Base-10 Conversion', 'sprintfc', 'addition of "0"'})

    xlabel('Number of Rows in A')
    ylabel('Execution Time (ms)');
end

function out = string_reshape_method(A)
    out = cellstr(reshape(sprintf('%d', A), [], size(A,2)));
end

function out = base10_method(A)
    out = sprintfc('%d', A * (10.^(size(A, 2)-1:-1:0)).');
end

function B = sprintfc_method(A)
    B = sprintfc(repmat('%d', 1, size(A,2)), A);
end

function B = addition_method(A)
    B = cellstr(char(A + '0'));
end

Convert a single DataRow (with strings and ints) into a List<string> c#


Tag : chash , By : Brownell
Date : March 29 2020, 07:55 AM
hope this fix your issue Your mistake is that you don't want to cast the objects to a string but to convert them. The easiest way for your requirements would be something like:
situationRisk.ItemArray.Select(i => i.ToString()).ToList();
situationRisk.ItemArray.Select(i => i?.ToString()).ToList();
situationRisk.ItemArray.Select(i => i?.ToString() ?? string.Empty).ToList();

Error "Cannot implicitly convert type 'System.Data.DataRow' to..." when trying to pass the first DataRow of a


Tag : chash , By : Hans-Inge
Date : March 29 2020, 07:55 AM
This might help you I have a DataSet created in VS 2017 DS designer and I am trying to retrieve the first row returned from the DataAdapter. When I try to pass the first row ([TblEventTypes.Rows[0]) in TypesRow I get the error , try
TypesRow = (EventTypesRow)(tblEventTypes.Rows[0]);
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