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C# 7 cleanup: pattern matching for TryStringSplit

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This commit is contained in:
Nick Craver
2017-05-07 16:10:47 -04:00
parent f613234413
commit d52067c896
1 changed files with 15 additions and 12 deletions
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Dapper/SqlMapper.cs
+15 -12
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@@ -1975,24 +1975,27 @@ namespace Dapper
private static bool TryStringSplit(ref IEnumerable list, int splitAt, string namePrefix, IDbCommand command, bool byPosition)
{
if (list == null || splitAt < 0) return false;
if (list is IEnumerable<int>) return TryStringSplit<int>(ref list, splitAt, namePrefix, command, "int", byPosition,
(sb, i) => sb.Append(i.ToString(CultureInfo.InvariantCulture)));
if (list is IEnumerable<long>) return TryStringSplit<long>(ref list, splitAt, namePrefix, command, "bigint", byPosition,
(sb, i) => sb.Append(i.ToString(CultureInfo.InvariantCulture)));
if (list is IEnumerable<short>) return TryStringSplit<short>(ref list, splitAt, namePrefix, command, "smallint", byPosition,
(sb, i) => sb.Append(i.ToString(CultureInfo.InvariantCulture)));
if (list is IEnumerable<byte>) return TryStringSplit<byte>(ref list, splitAt, namePrefix, command, "tinyint", byPosition,
(sb, i) => sb.Append(i.ToString(CultureInfo.InvariantCulture)));
switch (list)
{
case IEnumerable<int> l:
return TryStringSplit(ref l, splitAt, namePrefix, command, "int", byPosition, (sb, i) => sb.Append(i.ToString(CultureInfo.InvariantCulture)));
case IEnumerable<long> l:
return TryStringSplit(ref l, splitAt, namePrefix, command, "bigint", byPosition, (sb, i) => sb.Append(i.ToString(CultureInfo.InvariantCulture)));
case IEnumerable<short> l:
return TryStringSplit(ref l, splitAt, namePrefix, command, "smallint", byPosition, (sb, i) => sb.Append(i.ToString(CultureInfo.InvariantCulture)));
case IEnumerable<byte> l:
return TryStringSplit(ref l, splitAt, namePrefix, command, "tinyint", byPosition, (sb, i) => sb.Append(i.ToString(CultureInfo.InvariantCulture)));
}
return false;
}
private static bool TryStringSplit<T>(ref IEnumerable list, int splitAt, string namePrefix, IDbCommand command, string colType, bool byPosition,
private static bool TryStringSplit<T>(ref IEnumerable<T> list, int splitAt, string namePrefix, IDbCommand command, string colType, bool byPosition,
Action<StringBuilder, T> append)
{
ICollection<T> typed = list as ICollection<T>;
if(typed == null)
var typed = list as ICollection<T>;
if (typed == null)
{
typed = ((IEnumerable<T>)list).ToList();
typed = list.ToList();
list = typed; // because we still need to be able to iterate it, even if we fail here
}
if (typed.Count < splitAt) return false;