public void StartPart()
{
this.AssertOpen();
MimeWriteState mimeWriteState = this.state;
if (mimeWriteState == MimeWriteState.Complete || mimeWriteState == MimeWriteState.PartContent)
{
throw new InvalidOperationException(Strings.CannotStartPartHere);
}
if (this.partDepth != 0)
{
this.FlushHeader();
if (!this.currentPart.IsMultipart)
{
throw new InvalidOperationException(Strings.NonMultiPartPartsCannotHaveChildren);
}
if (!this.foundMimeVersion && this.forceMime && this.partDepth == 1)
{
this.WriteMimeVersion();
}
this.Write(MimeString.CrLf, 0, MimeString.CrLf.Length);
this.WriteBoundary(this.currentPart.Boundary, false);
}
MimeWriter.PartData partData = default(MimeWriter.PartData);
this.PushPart(ref partData);
this.state = MimeWriteState.StartPart;
this.contentWritten = false;
this.contentTransferEncoding = ContentTransferEncoding.SevenBit;
}
private void PushPart(ref MimeWriter.PartData part)
{
if (this.partStack == null)
{
this.partStack = new MimeWriter.PartData[8];
this.partDepth = 0;
}
else if (this.partStack.Length == this.partDepth)
{
MimeWriter.PartData[] destinationArray = new MimeWriter.PartData[this.partStack.Length * 2];
Array.Copy(this.partStack, 0, destinationArray, 0, this.partStack.Length);
for (int i = 0; i < this.partDepth; i++)
{
this.partStack[i] = default(MimeWriter.PartData);
}
this.partStack = destinationArray;
}
if (this.partDepth != 0)
{
this.partStack[this.partDepth - 1] = this.currentPart;
}
this.partStack[this.partDepth++] = part;
this.currentPart = part;
}