Reset stream position (fixes #331)

Author: mganss

ExcelMapper/ExcelMapper.cs

@@ -792,6 +792,7 @@ public async Task<IEnumerable<T>> FetchAsync<T>(Stream stream, string sheetName,
     public async Task<IEnumerable<dynamic>> FetchAsync(Stream stream, string sheetName, Func<ValueConverterArgs, object> valueConverter = null)
     {
         using var ms = await ReadAsync(stream);
+        ms.Position = 0;
         return Fetch(ms, sheetName, valueConverter);
     }
 
@@ -806,6 +807,7 @@ public async Task<IEnumerable<dynamic>> FetchAsync(Stream stream, string sheetNa
     public async Task<IEnumerable> FetchAsync(Stream stream, Type type, string sheetName, Func<ValueConverterArgs, object> valueConverter = null)
     {
         using var ms = await ReadAsync(stream);
+        ms.Position = 0;
         return Fetch(ms, type, sheetName, valueConverter);
     }
 
@@ -832,6 +834,7 @@ public async Task<IEnumerable<T>> FetchAsync<T>(Stream stream, int sheetIndex =
     public async Task<IEnumerable<dynamic>> FetchAsync(Stream stream, int sheetIndex = 0, Func<ValueConverterArgs, object> valueConverter = null)
     {
         using var ms = await ReadAsync(stream);
+        ms.Position = 0;
         return Fetch(ms, sheetIndex, valueConverter);
     }
 
@@ -846,6 +849,7 @@ public async Task<IEnumerable<dynamic>> FetchAsync(Stream stream, int sheetIndex
     public async Task<IEnumerable> FetchAsync(Stream stream, Type type, int sheetIndex = 0, Func<ValueConverterArgs, object> valueConverter = null)
     {
         using var ms = await ReadAsync(stream);
+        ms.Position = 0;
         return Fetch(ms, type, sheetIndex, valueConverter);
     }