1
問題的表達式類型的變量「緩衝」「System.Text.StringBuilder」從範圍「引用」,但它沒有定義
private Func GenerateWriter()
{
MethodInfo appendMethod = typeof(StringBuilder).GetMethod("Append",
new[] { typeof(string) });
var buffer = Expression.Variable(typeof(StringBuilder), "buffer");
var writer = new List<Expression>();
var source = Expression.Parameter(typeof(string[]));
writer.Add(Expression.Assign(buffer, Expression.New(typeof(StringBuilder))));
//add some strings to buffer
writer.Add(Expression.Call(buffer, "ToString", null));
var f = Expression.Lambda<Func<string[], string>>
(Expression.Block(writer.ToArray()), source).Compile();
return f;
} 我已經得到了這樣的信息: 變量'的緩衝區鍵入'System.Text.StringBuilder' 引用範圍'',但它沒有定義
我不明白是什麼錯誤。一切似乎都正確。 請幫幫我!
謝謝!有用! – Roman 2010-07-20 18:28:26