INNER CODE UNIT · C#

groups

Nonanti/PipeFlow · samples/PipeFlow.Sandbox/Program.cs:316

    var groups = rows.GroupBy(r => r["Dept"]).ToDictionary(g => (string)g.Key!, g => g.Count());
    return groups["Eng"] == 2 && groups["HR"] == 1;
});

runner.Run("3.10 DataRow as Dictionary key (round-trip lookup)", () =>
{
    var key1 = new DataRow { ["Id"] = 1 };
    var key2 = new DataRow { ["Id"] = 1 }; // structurally equal to key1
    var dict = new Dictionary<DataRow, string> { [key1] = "first-insertion" };
    return dict.ContainsKey(key2) && dict[key2] == "first-insertion";
});

runner.Run("3.11 mutation invalidates cached hash", () =>
{
    var row = new DataRow { ["X"] = 1 };
    var before = row.GetHashCode();
    row["X"] = 99;
    var after = row.GetHashCode();

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