Aspose.Word郵件合併之自定義數據源

Aspose.Word在進行郵件合併時，預設的幾個重載方法對Database支持比較友好，但是也可以通過自定義數據源來實現從集合或者對象中返回數據進行郵件合併。

自定義數據源主要是通過實現IMailMergeDataSource介面來實現的。官方的例子如下：

[C#]

public void MailMergeCustomDataSource()
{
    // Create some data that we will use in the mail merge.
    CustomerList customers = new CustomerList();
    customers.Add(new Customer("Thomas Hardy", "120 Hanover Sq., London"));
    customers.Add(new Customer("Paolo Accorti", "Via Monte Bianco 34, Torino"));

    // Open the template document.
    Document doc = new Document(MyDir + "MailMerge.CustomDataSource.doc");

    // To be able to mail merge from your own data source, it must be wrapped
    // into an object that implements the IMailMergeDataSource interface.
    CustomerMailMergeDataSource customersDataSource = new CustomerMailMergeDataSource(customers);

    // Now you can pass your data source into Aspose.Words.
    doc.MailMerge.Execute(customersDataSource);

    doc.Save(MyDir + "MailMerge.CustomDataSource Out.doc");
}

/// <summary>
/// An example of a "data entity" class in your application.
/// </summary>
public class Customer
{
    public Customer(string aFullName, string anAddress)
    {
        mFullName = aFullName;
        mAddress = anAddress;
    }

    public string FullName
    {
        get { return mFullName; }
        set { mFullName = value; }
    }

    public string Address
    {
        get { return mAddress; }
        set { mAddress = value; }
    }

    private string mFullName;
    private string mAddress;
}

/// <summary>
/// An example of a typed collection that contains your "data" objects.
/// </summary>
public class CustomerList : ArrayList
{
    public new Customer this[int index]
    {
        get { return (Customer)base[index]; }
        set { base[index] = value; }
    }
}

/// <summary>
/// A custom mail merge data source that you implement to allow Aspose.Words 
/// to mail merge data from your Customer objects into Microsoft Word documents.
/// </summary>
public class CustomerMailMergeDataSource : IMailMergeDataSource
{
    public CustomerMailMergeDataSource(CustomerList customers)
    {
        mCustomers = customers;

        // When the data source is initialized, it must be positioned before the first record.
        mRecordIndex= -1;
    }

    /// <summary>
    /// The name of the data source. Used by Aspose.Words only when executing mail merge with repeatable regions.
    /// </summary>
    public string TableName
    {
        get { return "Customer"; }
    }

    /// <summary>
    /// Aspose.Words calls this method to get a value for every data field.
    /// </summary>
    public bool GetValue(string fieldName, out object fieldValue)
    {
        switch (fieldName)
        {
            case "FullName":
                fieldValue = mCustomers[mRecordIndex].FullName;
                return true;
            case "Address":
                fieldValue = mCustomers[mRecordIndex].Address;
                return true;
            default:
                // A field with this name was not found, 
                // return false to the Aspose.Words mail merge engine.
                fieldValue = null;
                return false;
        }
    }

    /// <summary>
    /// A standard implementation for moving to a next record in a collection.
    /// </summary>
    public bool MoveNext()
    {
        if (!IsEof)
            mRecordIndex++;

        return (!IsEof);
    }

    public IMailMergeDataSource GetChildDataSource(string tableName)
    {
        return null;
    }

    private bool IsEof
    {
        get { return (mRecordIndex >= mCustomers.Count); }
    }

    private readonly CustomerList mCustomers;
    private int mRecordIndex;
}

參考文檔：

https://apireference.aspose.com/net/words/aspose.words.mailmerging/imailmergedatasource