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C#のTry Catch Finally Throw

Last updated at Posted at 2019-12-20

タイトルの通り、C#での例外をCatch句内でthrowした挙動を確認してみました。

環境:Visual Studio2017,.net472

Form.cs
private void button1_Click(object sender, EventArgs e)
{
    textBox1.Text += "①実行開始" + Environment.NewLine;
    try
    {
        Method();
    }
    catch
    {
        textBox1.Text += "⑤実行中 呼び出し元のCatch" + Environment.NewLine;
    }
    textBox1.Text += "⑥実行完了" + Environment.NewLine;
}

private void Method()
{
    try
    {
        textBox1.Text += "②実行中 Try" + Environment.NewLine;
        throw new Exception();
    }
    catch
    {
        textBox1.Text += "③実行中 Catch" + Environment.NewLine;
        throw;
    }
    finally
    {
        textBox1.Text += "④実行中 Finally" + Environment.NewLine;
    }
    textBox1.Text += "⑤実行されない Try外" + Environment.NewLine;
}

実行結果

①実行開始
②実行中 Try
③実行中 Catch
④実行中 Finally
⑤実行中 呼び出し元のCatch
⑥実行完了

知識の浅い自分は'throw'したらFinallyの実行順がどうなるのか…?
と思って確認した結果です。

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