Best practice to check if DataRow contains a certain column

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At the moment, when I iterate over the DataRow instances, I do this.

foreach(DataRow row in table)
  return yield new Thingy { Name = row["hazaa"] };

Sooner of later (i.e. sooner), I'll get the table to be missing the column donkey and the poo will hit the fan. After some extensive googling (about 30 seconds) I discovered the following protection syntax.

foreach(DataRow row in table)
  if(row.Table.Columns.Contains("donkey"))
    return yield new Thingy { Name = row["hazaa"] };
  else
    return null;

Now - is this the simplest syntax?! Really? I was expecting a method that gets me the field if it exists or null otherwise. Or at least a Contains method directly on the row.

Am I missing something? I'll be mapping in many fields that way so the code will look dreadfully unreadable...

You can create an extension method to make it cleaner:

static class DataRowExtensions
{
    public static object GetValue(this DataRow row, string column)
    {
        return row.Table.Columns.Contains(column) ? row[column] : null;
    }
}

Now call it like below:

foreach(DataRow row in table)
    return yield new Thingy { Name = row.GetValue("hazaa") };

How to check particular datacolumn contains given value with out , Use DataTable 's Select(String expression) method. This method returns an array of DataRow s ( DataRow[] ). So all you have to do is to check� Best practice to check if DataRow contains a certain column. Ask Question Asked 6 years, 4 months ago. Best practice to return errors in ASP.NET Web API. 525.

As your DataTable table always has the same columns ( they won`t change for any row ) you only need to check for the columnname once.

if (table.Columns.Contains("donkey"))
{
    foreach ...
}

Finding out if a value exists in a database column - Build, I tried with ExtractDataTable (output of data scrapping) then for each row, Check if a column contains a certain value Well, so far so good - looks like it works. Home � Categories � FAQ/Guidelines � Terms of Service � Privacy Policy. column - how to check datarow is null or empty in c# Best practice to check if DataRow contains a certain column (2) At the moment, when I iterate over the DataRow instances, I do this.

foreach (DataColumn item in row.Table.Columns)
{
    switch (item.ColumnName)
    {
        case "ID":
            {
                p.ID = Convert.ToInt32(row[item.ColumnName].ToString());
            }
            break;
        case "firstName":
            {
                p.firstName = row[item.ColumnName].ToString();
            }
            break;
        case "lastName":
            {
                p.lastName = row[item.ColumnName].ToString();
            }
            break;

        default:
            break;
    };
}

How to check if a column exists in a datarow? Solutions, but how can I check that row["name"] actually exists? There's no 'Contains' method I can use? Thanks Wint. Comment� How To Check If a Column Exists in DataRow. Friends, This is a very small post to explain how can you check whether a column exists in a DataRow. This is a very handy tip when you are working with a set of data and you’re not sure everytime the query will return a specific column.

To build on the answer by Varun K, use a generic type parameter:

public static T GetValue<T>(this DataRow row, string column)
{
    if (!row.Table.Columns.Contains(column))
        return default(T);

    object value = row[ColumnName];
    if (value == DBNull.Value)
        return default(T);
    return (T)value;
}

DataRowCollection.Contains Method (System.Data), Best practice to check if DataRow contains a certain column, You can create an extension method to make it cleaner: static class DataRowExtensions { public� Find answers to How to check if a column exists in a datarow? from the expert community at Experts Exchange

Checking a column if it contains a row value, Create database/table/row, using MySQL EXISTS function. Today, we will look into some of the applications and the 3 best ways to check if Hence, instead of using '*', you can consider extracting only a single value as a column. If you want to check out for a record entry in the fastest way, you can consider using the � Examples. The following Visual Basic example uses the Contains method to determine whether a DataRowCollection object contains a specific value.. Private Sub ColContains() Dim table As DataTable = CType(DataGrid1.DataSource, DataTable) Dim rowCollection As DataRowCollection = table.Rows If rowCollection.Contains(Edit1.Text) Then Label1.Text = "At least one row contains " & Edit1.Text Else

Top 3 best ways to check if Mysql row exists -Querychat, To test whether a row exists in a MySQL table or not, use exists condition. we will insert some records with the help of INSERT command. This approach might be preferred over the one that uses the Contains("ColumnName") method when the following code will subsequently need to get that DataColumn for further usage. For example, you may want to know which type has a value stored in the column: Dim column = DataRow.Table.Columns("ColumnName") If column IsNot Nothing Then Dim type

Best way to test if a row exists in a MySQL table, We could create a data table and add columns in the following way: A DataTable object has a built-in select method that has the following WriteLine(" \n Checking whether a person having name 'SAM' exists or not"); if(dt. Examples. The following example prints each column of each row in each table of a DataSet.If the row is set to a null value, the value is not printed. Private Sub PrintRows(dataSet As DataSet) Dim table As DataTable Dim column As DataColumn Dim row As DataRow For Each table In dataSet.Tables For Each row In table.Rows For Each column In table.Columns If Not row.IsNull(column) Then Console

Comments
  • This was a nice solution. Not sure why it didn't get upvoted more. +1 from me anyway.
  • WoW! A Very neat solution. Thank you!
  • Nice one! However, implemented in the wild it should also check that row and column are ok values.
  • This is nice for one column but however, as op said there will eventually be many columns so how will you manage them if you don't have an idea which may be present and which may not?
  • @Varun, I for sure wouldn't keep the fixed string. What would you do if the column hazaa won`t exist anymore ?
  • @Heslacher That's the whole point. I need to manage that the column will sometimes come up and sometimes not. I have no control over that but I need to managed it still. Your example forks for a single column and can be extrapolated for multiple. However, please note that the question is if there's syntax for the check other than via table as you presented.
  • This is actually perfect for what I need. (I don't love it, but I don't think I can do better...)