C# getting an error. Cannot implicity convert from System.Data.DataRow to DataRow
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);
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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();
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convert from double to strings
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
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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();
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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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